Known issue: Immediately after upgrading, users may have trouble loading Xamarin.Android projects. Please restart Xamarin Studio again if you experience this.

Visual Studio Users: You should be prompted with this update when you open a Mono for Android project. You can also check manually in Tools > Options > Mono for Android.

MonoDevelop Users: You should be prompted to upgrade next time you open MonoDevelop, or you can use Help > Check for Updates. IDE support requires Xamarin Studio 4.0. Layout Designer fixes require MonoDevelop 3.0.4.

• System.Runtime.Serialization.dll can now be used by Starter edition projects.
• Starter addition projects can now use any assembly that is signed with the Xamarin key.
• Xamarin.Android on OS X now installs into /Library/Frameworks/Xamarin.Android.framework/Versions . Previously installed versions are moved into an appropriate subdirectory. /Developer/MonoAndroid is preserved as a symlink. (Primary rationale: Xcode is prone to removing the /Developer/MonoAndroid directory, which would wipe out Xamarin.Android installs.)

• [Android designer] Properly resize margin handles when zooming
• Fix GC bug for objects larger than 64KB.
• 9340 : Debug symbols are distributed only when $(DebugSymbols) is True and $(DebugType) is Full .
• 9370 : AndroidResource in managed library needs to prohibit uppercase names or give decent naming
• 9433 : Breakpoint not hit when disable fastdebug and linking sdk assemblies only
• 10061 : Toolbar buttons disabled on Windows 8 + Visual Studio 2012
• 10078 : More complicated Resource designer update is required for dependencies
• 10127 : WeakReference.Target can be garbage with SGEN?
• 10364 : UI lockup on start debugging
• 10390 : User shown INVALID workflow when they have entitlements on disk created by Visual Studio being run as Administrator.
• 10530 : Package APK option disabled
• 10669 : mandroid doesn't work if %CD% contains non-ASCII characters
• 10770 : MakeBundleNativeCodeExternal task needs to capture and log mkbundle stdout & stderr
• 10828 : android-support-v4.jar should be whitelisted
• 10851 : Cannot build any projects with a clean installation
• 10927 : MandroidDaemon hangs
• 11115 : Inspecting object in debugger throws exception.

• API Level 4: Mono.Android.dll , Mono.Android.GoogleMaps.dll , Mono.Android.Support.v4.dll , OpenTK.dll , OpenTK-1.0.dll
• API Level 7: Mono.Android.dll , Mono.Android.GoogleMaps.dll , Mono.Android.Support.v4.dll , OpenTK.dll , OpenTK-1.0.dll
• API Level 8: Mono.Android.dll , Mono.Android.GoogleMaps.dll , Mono.Android.Support.v4.dll , OpenTK.dll , OpenTK-1.0.dll
• API Level 10: Mono.Android.dll , Mono.Android.GoogleMaps.dll , Mono.Android.Support.v4.dll , OpenTK.dll , OpenTK-1.0.dll
• API Level 12: Mono.Android.dll , Mono.Android.GoogleMaps.dll , Mono.Android.Support.v4.dll , OpenTK.dll , OpenTK-1.0.dll
• API Level 14: Mono.Android.dll , Mono.Android.GoogleMaps.dll , Mono.Android.Support.v4.dll , Mono.Android.Support.v13.dll , OpenTK.dll , OpenTK-1.0.dll
• API Level 15: Mono.Android.dll , Mono.Android.GoogleMaps.dll , Mono.Android.Support.v4.dll , Mono.Android.Support.v13.dll , OpenTK.dll , OpenTK-1.0.dll
• API Level 16: Mono.Android.dll , Mono.Android.GoogleMaps.dll , Mono.Android.Support.v4.dll , Mono.Android.Support.v13.dll , OpenTK.dll , OpenTK-1.0.dll
• API Level 17: Mono.Android.dll , Mono.Android.GoogleMaps.dll , Mono.Android.Support.v4.dll , Mono.Android.Support.v13.dll , OpenTK.dll , OpenTK-1.0.dll

Warning: Samsung shipped a broken kernel with Android 2.1, which is not able to support JIT compilation. If you possess a Galaxy-class device with Android 2.1, you will get unexpected results, this is caused by a kernel bug that breaks cache coherency, rendering any engine doing JIT compilation useless. Check with your manufacturer/carrier for an Android 2.2 update.