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When exiting monodevelop which has a solution open, I frequently get the following exception, mostly (only?) if monodevelop window loses focus while shutdown is in progress (which takes some seconds).
ERROR [2012-05-07 22:51:14Z]: An unhandled exception has occured. Terminating MonoDevelop? True
System.InvalidOperationException: Handle is not allocated
at System.Runtime.InteropServices.GCHandle.get_Target () [0x0001b] in mono-git-c5a9e2fd/mcs/class/corlib/System.Runtime.InteropServices/GCHandle.cs:80
at System.WeakReference.get_Target () [0x00000] in mono-git-c5a9e2fd/mcs/class/corlib/System/WeakReference.cs:95
at Mono.Addins.ExtensionContext.DisposeChildContext (Mono.Addins.ExtensionContext ctx) [0x00039] in mono-addins-0.6.2/Mono.Addins/Mono.Addins/ExtensionContext.cs:142
at Mono.Addins.ExtensionContext.Finalize () [0x0000b] in mono-addins-0.6.2/Mono.Addins/Mono.Addins/ExtensionContext.cs:79
Is this still an issue?
No, I haven't seen this in quite a while, and can't reproduce it now.