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Created attachment 17336 [details]
IDE log describing the issue
It seems that when there is a mismatch of Xamarin.iOS Versions between the Mac and Windows(VS), there is not a warning in Visual Studio 2015, but it will crash the IDE instead with the following log entry:
The installed Xamarin.iOS (version 9.8) on the Mac Jons-MacBook-Pro.local (192.168.1.12) is not compatible with the local Xamarin.iOS 9.99.
This is definitely less than ideal as it should not crash the IDE and should rather give an error in the "Error List" tab and point the user to their IDE logs to discover this error.
I am able to reproduce this when having the Windows Version at Xamarin.iOS 126.96.36.199(Current Beta) and the Mac on Xamarin.iOS 188.8.131.52(Current Stable)
Microsoft Visual Studio Professional 2015
Version 14.0.25421.03 Update 3
Microsoft .NET Framework
Installed Version: Professional
Xamarin 184.108.40.2068 (f4d4600)
Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android.
Xamarin.Android 220.127.116.11 (89d9d60)
Visual Studio extension to enable development for Xamarin.Android.
Xamarin.iOS 18.104.22.168 (974ea0b)
Visual Studio extension to enable development for Xamarin.iOS.
*** This bug has been marked as a duplicate of bug 43926 ***