Stable Release: Cycle 8 Service Release 0 w/ Xcode8.1 Support

We are releasing updated builds of Cycle 8 Service Release 0 to the Stable channel. These build support the final release of Xcode 8.1 from Apple (released today).

If you notice an error in this blog post or have trouble downloading one of the installer packages, please let us know in the corresponding forum thread.


Remaining higher visibility known issues related to Xcode 8.1

  • [Xamarin Studio] – 45861 – “May Slow Down Your iPhone … The developer of this app needs to update it to improve its compatibility.” because of default “i386” supported architecture setting in the iPhoneSimulator configuration on new projects
    • Fix: Change Project options > iOS Build > Supported architectures to x86_64 (instead of the default i386) for the iPhoneSimulator configuration.
  • [Xamarin.iOS] – 45899 – “error HE0035: Could not find a paired iPhone device for the Watch ‘watchOS 3.1 (14S471a) – Apple Watch – 42mm’ (C64439C5-9D9C-4B5C-B3B5-F77BBAA5B669)” when attempting to launch watch app on series1 sim

Other higher visibility known issues

  • [Xamarin.Android]46279 – “C:\Program Files (x86)\MSBuild\Xamarin\Android\mono-symbolicate” store-symbols … “obj\Release\android/assets” …  exited with code -1073740791″ and “Assertion at ..\mono\metadata\class.c:5078, condition `class’ not met” when attempting to create Android packages in the Release configuration.
    • Beta channel: The current Beta versions are not affected by this issue, so updating to Beta is one possible workaround.
    • Alternate partial workaround: Disable the symbolication step by opening the Android app project .csproj file in a text editor and changing the following line anywhere that it appears to say “false” instead of “true”: <AndroidManagedSymbols>true</AndroidManagedSymbols>

Intentional changes in Xcode 8.1 itself
As usual, be sure to also check the upstream release notes.

  • “May Slow Down Your iPhone … The developer of this app needs to update it to improve its compatibility.” alert dialog will be displayed when 32-bit applications are launched on 64-bit devices and simulators.
    • Fix: Be sure to configure your project to provide a 64-bit build for 64-bit devices.

Products Released


Release Dates

Stable – This Release!

Technical Bulletin: Xcode 8.1 GM

As announced on Apple’s developer news site, Apple has just released the Xcode 8.1 GM seed.

Due to a few changes in the Xcode 8.1 GM version as compared to the previous Beta, Xamarin recommends against updating to Xcode 8.1 GM until a corresponding Xamarin compatibility release has been provided. Work is in progress to publish the core compatibility changes needed. The fixes for 45676 and 45855 are particularly important to make it straightforward to deploy to iOS devices and simulators without tricky workarounds.  New builds will tentatively be available before the end of the week.


Higher visibility known issues

  • [Xamarin for Visual Studio]45676 – “Failed to launch the simulator: Could not load the framework ‘libswiftAppKit.dylib’ … Library not loaded: @rpath/libswiftQuartzCore.dylib” when attempting to launch iOS 10.1 simulator.
  • [Xamarin.iOS]45855 – “Failed to launch the simulator: Could not load the framework ‘libswiftos.dylib’ (path: /Applications/Xcode.app/Contents/Frameworks/libswiftos.dylib): not found.” when attempting to launch iOS 10.1 simulator. Note: The public bug report mentions a fairly simple although inelegant workaround.
  • 45859 – “Error MT0074: Xamarin.iOS 10.0.2 does not support a deployment target of 10.1 for iOS (the maximum is 10.0).” when attempting to build a new template project that uses the new default deployment target of 10.1
    • Workaround: Open the Info.plist file in the plist editor and change the deployment target to 10.0 or lower instead of 10.1.
  • [Xamarin Studio], [Xamarin for Visual Studio] – 45861, 45862 – “May Slow Down Your iPhone … The developer of this app needs to update it to improve its compatibility.” because of default “i386” supported architecture setting in the iPhoneSimulator configuration on new projects
    • Fix: Change Project options > iOS Build > Supported architectures to x86_64 (instead of the default i386) for the iPhoneSimulator configuration.
  • [Xamarin.iOS] – 45899 – “error HE0035: Could not find a paired iPhone device for the Watch ‘watchOS 3.1 (14S471a) – Apple Watch – 42mm’ (C64439C5-9D9C-4B5C-B3B5-F77BBAA5B669)” when attempting to launch watch app on series1 sim

Intentional changes in Xcode 8.1 itself
As usual, be sure to also check the upstream release notes.

  • “May Slow Down Your iPhone … The developer of this app needs to update it to improve its compatibility.” alert dialog will be displayed when 32-bit applications are launched on 64-bit devices and simulators.
    • Fix: Be sure to configure your project to provide a 64-bit build for 64-bit devices.

Edits on this post

  • Oct 25, 2016: Add Bug 45899.

Beta Release: Cycle 8 Service Release 1

We are releasing a Beta preview of our next release, called Service Release 1. This should address some of the issues reported after the release of Cycle 8.

 As this is a Beta build, there are some known issues and the possibility of new issues being found during testing.

Please check out the product release notes to see all the fixes and known issues for this release.

If you see a behavior that looks suspicious in these versions, and if it isn’t clear whether one of the known issues in the release notes matches the problem, please file a quick bug report to let the team know.

If you notice an error in this blog post or have trouble downloading one of the installer packages, please let us know in the corresponding forum thread.


Known Issues

  • [Xamarin for Visual Studio], [Xamarin Studio] – Upcoming compatibility feature, tracked in 44330 – “This version does not have support for files saved in Xcode 8 format” appears when attempting to edit a file with the Xamarin iOS designer after having edited the file with Xcode 8. Xcode 8 introduced a new, non-backwards-compatible XML format for Interface Builder documents that is not yet supported in Xamarin’s iOS designer. As it turns out, the beta version of Xcode 8.1 from Apple has in fact backed out of several of those format changes. Candidate fixes are now under test for Xamarin’s iOS designer to cover the remaining format changes as present in Xcode 8.1.
  • [Xamarin.Android]44193 “Consider app.config remapping of assembly “System.Runtime…” from Version “4.0.0.0”” and similar warnings when building Xamarin.Android apps.
    • Candidate workaround: Create a new .xml file named app.config at the root level of the Xamarin.Android app project, and then paste in the binding redirect as listed in Bug 44193, Comment 18.
  • [Xamarin Studio]43188 – Sporadic “Out of memory” error during build leaves solution in an unbuildable state until the project is reloaded.
    • Improved in this release: Cycle 8 Service Release 1 includes some fixes that should hopefully eliminate the need to reload the project in this scenario. Additional fixes for the “Out of memory” error itself are also planned.
  • [Xamarin for Visual Studio]45719 – The Xamarin.VisualStudio .msi installer has increased in size by roughly 50% due to code signing changes that broke some of the de-duplication techniques used in the installer. The corresponding on-disk installation size has increased by roughly 18%.
  • [Xamarin for Visual Studio], [Xamarin Studio]43566 – In a few remaining scenarios, the iOS Designer initialization process might still cause a running iOS 10 simulator to become non-responsive. The designer initialization happens when opening an iOS project in Xamarin Studio and during the connection to the remote Mac in Visual Studio. This issue does not affect Xcode 7.3, iOS 9.3 (and lower) simulators.
    • Workaround: Quit and restart the simulator after the designer has initialized. You can then proceed to use the simulator again as normal.

Products Released

  • Xamarin Studio 6.1.2.38
  • Release Notes
    • Issues Addressed:
      • 45535 – User is not seeing iOS Simulator in Xamarin Studio
      • 43675 – New “run configurations” menu means we can’t see which emulator is selected
      • 45358 – User is not seeing iOS Simulator in Xamarin Studio when using Xcode 8.1 beta
      • 42779 – Random crash caused by LogViewProgressMonitor
      • 44537 – XS 6.x branches are not reading XML documentation from 3rd party libraries
      • 44378 – Mac Migration Tool Not Working
      • 44285 – Xcode 8 quits after Xamarin Studio returns to the foreground when using Xcode 8 via Open With > Xcode Interface Builder.
      • 44144 – Cannot open axml files using Layout Editor
      • 40314 – “Reopen Closed Tab” option does not work on Assembly Browser tabs
      • 38791 – Update default product templates to benefit from C#6
      • 15222 – Open With doesn’t work when file is open in another editor
      • 34994 – Dialogs do not highlight default [“Return”] button on Mac
  • Xamarin.VS 4.2.1.15
  • Release Notes
    • Issues Addressed:
      • 44997 – Android Designer shows progress indicator indefinitely
      • 44468 – Can’t save 120×120 App Icons in Info.plist editor
      • 45122 – Import Existing Keystore fails with java.io.IOException: Keystore was tampered with, or password was incorrect
      • 44567 –  “Launch failed. The app ‘app’ could not be launched on ‘iPhone’: Object reference not set to an instance of an object” when attempting to deploy to certain iOS devices in certain environments.
      • 44958 – No Available Devices are Listed After Changing Start Up Project via the Run button
      • 43316 – Native References in iOS Binding projects do not build in VS
      • 45249 – “Could not install package ‘Xamarin.Forms 2.2.0.45’. You are trying to install this package into a project that targets ‘Unsupported,Version=v0.0′” when adding a new XAML page to a Forms Shared Project
      • 44432 – Entitlements view doesn’t save changes made in designer nor loads data from plist
      • 43948 – Android Designer shows progress indicator indefinitely
      • 44284 – User is not getting option ‘Top Shelf Image Wide’ under Assets catalogs for tvOS template in VS.
      • 38570 – “The project requires user input. Reload the project for more information” error prevents loading a newly created F# Blank App (Android) tempate app
      • 44394 – The error message shown in the Output window when attempting to use a 7.x device with Xcode 8 does not include the compatibility error returned by Xcode.
      • 44273 – “An error occurred trying to load the page.” appears in the “Project Properties > iOS Build” tab when not connected to a Mac
      • 45333 – [Android Archive Manager and Publishing Workflow Enhancements] Differentiator between Alias, Wizard Path, Key Details, Keystore Path
  • Xamarin.iOS 10.0.2.3
  • Release Notes
    • Issues Addressed:
      • 44701 – “Could not link assemblies” due to NullReferenceException in certain scenarios during bindings optimization
  • Xamarin.Android 7.0.2.28
  • Release Notes 
    • Issues Addressed:
      • 44535 – “‘System.ComponentModel.INotifyPropertyChanged’ is defined in an assembly that is not referenced. You must add a reference to assembly ‘System.ObjectModel” for projects that reference PCLs with `INotifyPropertyChanged`
      • 44633 – Enabling <AndroidUseSharedRuntime> in some projects causes `classes.dex` to not deploy to device
      • 34498 – AOT task fails if project path has a space in it
      • 43915 – Getting build error on Android F# app when using ‘Array.take’.
  • Mono Framework 4.6.1.13
  • Release Notes
    • Issues Addressed:
      • 39832 – SIGSEGV when running roslyn
      • 44349 – Mono.Data.Sqlite fails to store seconds in timestamp value to a table

Installing the Beta and switching back to Stable

You can install this new Beta version or switch back to the current Stable version by changing updater channels.


Upcoming Release Dates

Beta – This Release!

Stable – October 2016

Preview: Xamarin Profiler 0.38.0

Xamarin Profiler preview 0.38.0 is now available for download! There have been a number of fixes since our previous preview, which have been noted below.

Please note that the Mac app bundle has been renamed (from XamarinProfiler.Mac.app to “Xamarin Profiler.app”), so the old version needs to be removed before installing this new update, so that Xamarin Studio prompts the user for the new location.


Known Issues

  • No official support for profiling release builds is available at this time.
  • Data sets are correct at the time of collection, but data mining and representation is preliminary. This will improve in future releases.
  • Time instrument not available for Android and tvOS profiling.

Products Released


As with all our preview releases, this is not a product we officially support. If you encounter any issues, we recommend filing a bug in Bugzilla. You can also jump into the discussions on the forum thread posted below.

(UPDATED) Stable Release: Cycle 8 Service Release 0

Update We are releasing updated builds for some of our products on top of Cycle 8 Service Release 0 to address issues 4430042443, and 44708:

  • Xamarin.VS updated to 4.2.0.703
  • Xamarin.iOS updated to 10.0.1.10
  • Xamarin.Android updated to 7.0.1.3
  • Xamarin.Mac updated to 2.10.0.105
  • Mono Framework updated to 4.6.1.5

If you see a behavior that looks suspicious in these versions, and if it isn’t clear whether one of the known issues in the release notes matches the problem, please file a quick bug report to let the team know.

If you notice an error in this blog post or have trouble downloading one of the installer packages, please let us know in the corresponding forum thread.


Known Issues

  • [Xamarin Studio]44285 – Xcode 8 quits after Xamarin Studio returns to the foreground when using Xcode 8 via Open With > Xcode Interface Builder.
  • [Xamarin.Android]44633 – “Deployment failed because of an internal error: Failure [INSTALL_FAILED_DEXOPT]” when <AndroidUseSharedRuntime> is enabled in certain projects because classes.dex is not deployed to device as expected.
  • [Xamarin for Visual Studio]44535 – “‘System.ComponentModel.INotifyPropertyChanged’ is defined in an assembly that is not referenced. You must add a reference to assembly ‘System.ObjectModel” for projects that reference PCLs with INotifyPropertyChanged
  • [Xamarin for Visual Studio], [Xamarin Studio]43566 – The iOS Designer initialization process will cause any running iOS 10 simulator to become non-responsive. The designer initialization happens when opening an iOS project in Xamarin Studio and during the connection to the remote Mac in Visual Studio. This issue does not affect Xcode 7.3, iOS 9.3 (and lower) simulators.
    • Improved in this release: Cycle 8 Service Release 0 includes some fixes to reduce the chances of hitting this problem, but additional fixes are also planned.
    • Workaround: Quit and restart the simulator after the designer has initialized. You can then proceed to use the simulator again as normal.

Products Released

  • Xamarin Studio 6.1.1.15
    • Release Notes
    • Major Issues Addressed:
      • 42376 – Crash while loading certain solutions due to incorrect absolute path calculation
      • 43566 (via 44373) – The iOS Designer initialization process will cause any running iOS 10 simulator to become non-responsive.
      • 43655 – Cannot open ‘API Documentation’ in XS on Mac.
      • 43675 – New “run configurations” menu causes most of the emulator name to be cut off
      • 44021 – No way to set sticker icons source in iMessage extension
      • 44128 – Crash when closing designer window and changing API level
      • 44190 – iOS and tvOS Broadcast UI/Upload extension fails to build
      • 44282 – iOS and tvOS Broken Broadcast UI template
      • 44283 – Missing iPhone 7 and Apple Watch Series 2 simulators
      • 44293 – Incorrect target framework profile for new PCL in XS compared to VS
  • Xamarin.VS 4.2.0.703
    • Release Notes
    • Major Issues Addressed:
      • 44146 – “GetFullVsVersionString must be called on the UI thread” error appears when attempting to open Manage NuGet Packages for Solution, sometimes blocking the use of the NuGet package manager in projects that use Xamarin Components.
      • 43566 (via 44373) – The iOS Designer initialization process will cause any running iOS 10 simulator to become non-responsive.
      • 44482 – Unable to connect VS to mac build host
      • 44508 – Selecting a file via the file browser for “Custom entitlements” deletes the selected file from the file system rather than selecting it
      • 44269 – Android Designer with Custom Controls spins loading bar when x86 Java JDK is set as the active JDK under Tools > Options > Xamarin > Android Settings > Java Development Kit Location.
      • 44357 – Getting ‘codesign’ error when ‘Enable incremental builds’ option is checked in VS and no code signing certificate installed on build host.
      • 44262 – Google Play Publishing wizard fails after client id/secret are entered.
      • 44591 – “Run in Test Cloud” context menu item is missing in VS 2015
      • 44460 – ResolveLibraryProjectImports often fails not being able to delete.
      • (Updated) 44300 – Xamarin.Android projects appear as “incompatible” after closing and reopening a solution in a single VS session.
        • A remaining issue related to the Test Recorder preview feature is still under investigation, so it is recommended to uninstall Test Recorder if you continue to see this issue after updating.
  • Xamarin.iOS 10.0.1.10
    • Release Notes
    • Major Issues Addressed:
      • 44225 – “Error: TrustFailure (CertificateUnknown)” when using Apple TLS handler to access HTTPS servers that use virtual domains (via Server Name Indication).
      • 44073 – VTCompressionSession does not handle null sample buffer
      • 42395 – Build runs indefinitely and never finishes with LLVM enabled
      • 44122 – MTOUCH: error MT2001: Could not link assemblies. Reason: Value cannot be null.
      • (Updated) 42443 – ServicePointTest (System) test crash on tvOS device
  • Xamarin.Android 7.0.1.3
    • Release Notes
    • Major Issues Addressed:
      • 43883 – Android Support v7 AppCompat Binding Generator error with Android N preview (API Level 24)
      • 39859 – Xamarin.Android apps on the Samsung Galaxy S7 fails to start with the error System.ExecutionEngineException SIGILL
      • 43411 – HTTP Bad Request (400) when encoding space (%20) in URL with AndroidClientHandler
      • 44268 – “Unexpected libzip error: Inval” when building projects that reference any of the Android Support Libraries on Windows if the user name contains any accented characters.
      • 44448 – Urban Airship component causes native crash in Mono
      • 44184 – “The “BuildApk” task failed unexpectedly. Xamarin.Tools.Zip.ZipException: Entry has been changed” when attempting to archive or deploy apps in certain environments.
  • Mono Framework 4.6.1.5
    • Release Notes
    • Major Issues Addressed:
      • 44402 – “Cannot implicitly convert type `int[]’ to `System.Collections.IEnumerable'” and “Type `System.Array’ does not contain a member `OfType’ and the best extension method overload … requires an instance of type `System.Collections.IEnumerable'”.
      • 43655 – User is not able to open ‘API Documentation’ in XS on Mac.
      • (Updated) 44708 – “TrustFailure (The authentication or decryption has failed.) … Invalid certificate received from server.” with “Error code: 0x5” or “Error code: 0xffffffff800b010f” when attempting to access HTTPS servers on ports other than 443

Updating and downgrading
You can install this new version by checking for updates on the Stable updater channel.
You can downgrade back to the previous Cycle 8 (September 13, 2016) versions by manually reinstalling each old package. See the KB article on downgrading. If you would prefer an email with any older installer links you need, feel free to write to contact@xamarin.com to request the older versions.

  • For Mac you’ll need: Xamarin Studio, Xamarin.iOS, Xamarin.Android, and Mono.
  • For Windows you’ll need: Xamarin.VisualStudio (from either the Xamarin.Android or Xamarin.iOS drop-down menu), and optionally Xamarin Studio.

Older Mono package versions are not currently listed on https://store.xamarin.com/account/my/subscription/downloads. The Mono package for the previous Stable version (from September 13) is available here:


Upcoming Release Dates

Beta – Sept. 23rd, 2016

Stable – Sept. 26th, 2016

Updated Stable – This Release!