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Created attachment 2566 [details]
More Details dialog from Unobserved Task Exception
Using Visual Studio 2010 Professional.
New behaviour in Mono for Android 4.2.6.
Have not seen this happen in any previous versions including 4.2.4 and 4.2.5.
Different callstack and symptoms than bugs 4920 and 6944.
I have just installed the 4.2.6 update.
Ran a debug session on a Nexus S by pressing F5.
Stopped the debug session by pressing Shift+F5.
Made a small code change, pressed F5 to debug.
Unobserved Task Exception dialog popped up, but debug launch continued.
Ended debug session with Shift+F5 and Unobserved Task Exception dialog popped up again with the same callstack as shown in the attachment.
Should also note that the Nexus S is running stock Jellybean 4.1.1.
CCing Michael, since this seems to be in the shared IDE code.
I think this should have been fixed by androidtools 29d6d75eb4e196bdded297df7ec3f25f66b9aec0.