Date published: See https://releases.xamarin.com/.
You can downgrade back to the previous Stable version by manually reinstalling each old package. See the KB article on downgrading. If you have a Trial or Starter subscription, feel free to contact [email protected] to request the older versions.
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 ("Service Release 1") is available here:
If needed, you can also downgrade back to older versions (from before April 29) by manually reinstalling each old package. See the "Previous versions, downgrading" section on the April 29 release thread for the older downgrade links.
This first post will be updated regularly.
Hopefully this thread will help answer "what might break if I update to this release?"
If you find a new problem that is specific to this version, please file a bug report.
Please discuss older bugs that are unchanged in this release compared to the previous Stable version in Bugzilla instead.
Of course for questions and discussions about topics other than bugs, feel free start new forum threads.
Bug 28961 - [iOS] "error MT3001: Could not AOT the assembly", "error: invalid symbol redefinition". (This can also appear as "System.ArgumentOutOfRangeException: startIndex > this.length" in the "Output -> Xamarin Log" in VS.) One common cause of this error is the use of
[MethodImplAttribute(MethodImplOptions.Synchronized)]. Workaround for projects that use [MethodImplAttribute(MethodImplOptions.Synchronized)]: remove
[MethodImplAttribute(MethodImplOptions.Synchronized)] and manually synchronize the methods using
lock statements instead (https://bugzilla.xamarin.com/show_bug.cgi?id=28961#c6).
Non-public Bug 28995 - [Android] On certain devices, certain apps crash frequently due to "System.ExecutionEngineException: SIGILL".
Bug 30318 - [Android] Windows only: Breakpoints in PCL projects do not work after cleaning solution, redeploying, and restarting debugging. Partial workaround: delete all the
bin folders in the solution after cleaning. (The next Alpha build should include this fix.)
Non-public Bug 30057 - [Android] Windows only: the debugger will not be able resolve breakpoints unless "Shared Runtime" is ON and the Linker is OFF (under "Project Properties -> Android Options" in Visual Studio or "Project Options -> Android Build" in Xamarin Studio). (The next Alpha build should include this fix.)
Bug 29211 - [iOS] Enabling the linker when the solution includes a PCL that uses System.IO.Compression causes "Could not load file or assembly 'System.IO.Compression' or one of its dependencies" at run time. The same problem can also happen with System.Threading.Tasks (and probably also several other assemblies). Workaround: add
-linkskip=System.Threading.Tasks for System.Threading.Tasks) under "project options -> iOS Build -> Additional mtouch arguments".
Bug 30420 - [iOS]
this.TableView is called in the TableView constructor. Workaround: perform all initialization operations for the TableView in the
ViewWillAppear() methods rather than the constructor.
Bug 30072 - [Xamarin Studio] [Android] Xamarin Studio sometimes crashes with SIGABRT in
gtk_text_view_validate_onscreen() after password is entered during "Import an Existing Key" in "Build -> Archive for Publishing -> Sign and Distribute" workflow.
Non-public Bug 29538 - [Android] Profiling via the graphical Xamarin Profiler ("Run -> Start Profiling") causes the app to crash at startup.
Non-public Bug 29725 - [Xamarin Studio] [iOS] [Android] Expressions in the Watch window are cleared each time you stop debugging.
Bug 30513 - [Android] The logged stack traces from exceptions thrown within async methods do not include the actual location where the exception was thrown. Partial workaround: switch back to the old Xamarin.Android 4.x exception propagation style by setting the
XA_BROKEN_EXCEPTION_TRANSITIONS environment variable to
true (see also Bug 30513, Comment 11).
Bug 29326 - [Android] String resources defined in NuGet packages overwrite string resources defined in app project, causing the displayed app name to be incorrect for example. Workaround: avoid using the same string key that is used in the NuGet packages.
Non-public Bug 30481, Bug 29557 - [Mono] [Android] [iOS]
SqlConnection.GetSchema() fails with "SourceTable is required to be a non-empty string". (A fix for this issue is planned for the upcoming "Service Release 3.")
Bug 30548 - [Android] Under certain conditions new threads take several seconds to start. This problem seems to be triggered by Xamarin.Insights 1.10. Partial workarounds: upgrade Xamarin.Insights to version 1.10.3, downgrade to version 1.9, or remove it entirely.
Bug 29745 - [iOS] Error due to duplicate symbols during native compilation for device: "duplicate symbol _monoeg_g_array_new" (and many similar messages). Workarounds: disable profiling under "Project Properties -> iOS Build", or if your app uses the
-all_load linker flag (via either
LinkerFlags) try removing it.
Bug 28808 - [Xamarin Studio] Uncommon "Too many open files" error, possibly related to keeping a solution open in Xamarin Studio across several sleep/wake cycles, leads to an inability to save the solution, and consequently a loss of the solution file contents.
Bug 29001 - [Xamarin Studio] Under certain conditions, clicking in the universal search bar can trap the cursor focus, preventing text entry into the text editor window.
Bug 30915 - [Xamarin Studio] [Android] Xamarin Studio repeatedly asks for the password for the selected certificate when attempting to sign using
SHA1withDSA certificates from keystore files. Xamarin Studio should instead display the error message from
jarsigner: "private key algorithm is not compatible with signature algorithm" as it did in Xamarin Studio 5.8. (
MD5withRSA certificates do work without error.)
Bug 29731 - [Android]
Android.Bluetooth.BluetoothAdapter.Enable is incorrectly marked as
[Obsolete("deprecated")] for API level 20 and higher.
[Xamarin Studio] Xamarin Studio 5.9 for Mac requires OS X 10.9 or higher. The updater does not currently block this update on OS X 10.8. The behavior of the updater for this kind of version incompatibility will be improved in the future.
Bug 31527 - [Android] "The following assembly referenced from ... could not be loaded: Assembly: System.Runtime ... Version: 184.108.40.206" when using the "Shared Runtime" with the linker enabled. Workaround: set "Project Options -> Android Build -> Linker [tab] -> Linker behavior" to "Don't link" in Xamarin Studio or "Project Properties -> Android Options -> Linker [tab] -> Linking") to "None" in Visual Studio. Enabling linking when the "Shared Runtime" is enabled is an intentionally untested scenario (partly because the on-device "shared runtime" assemblies will necessarily never be linked). )
Bug 31597 - [Android] For some projects the generated
.mdb files are incorrect, causing breakpoints to be skipped or incorrect line numbers to appear in the call stacks. Candidate fix now on the Alpha channel. (Old workaround: add
Condition="'$(AndroidLinkMode)' != 'None' AND '$(AndroidUseSharedRuntime)' != 'true'" to the
StripEmbeddedLibraries task in
C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets on Windows or
/Library/Frameworks/Xamarin.Android.framework/Versions/Current/lib/xbuild/Xamarin/Android/Xamarin.Android.Common.targets on Mac.
Bug 31379, Bug 31560 - [iOS] Enabling the linker when the app references PCL projects that include "duplicate" System.Threading.Tasks references (for example when using the "Microsoft.Net.Http" NuGet in a .NET 4.0 PCL) causes "Could not load file or assembly 'System.Threading.Tasks'" on the simulator. This bug has in fact existed since the original April 29 release of Cycle 5, but until Service Release 2 it had been obscured by the closely related Bug 29211. The bug only affects simulator builds and has fairly easy workarounds, so it is minor in severity. Workarounds: disable the linker in the iPhoneSimulator configurations or add
-linkskip=System.Threading.Tasks under "project options -> iOS Build -> Additional mtouch arguments".
EDIT July 01: Typo correction. Add iOS Bug 31379.
EDIT July 07: Add Android bug 31527. Add Android bug 31597.
EDIT July 17: Mark bug fixes from new Alpha channel release: 31597. Add "release announcement" tag.
EDIT July 21: Add Android bug 30513.