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I do not get a messagebox stating where or what exception has been thrown if it is not an exception I have specified to be thrown myself (it is thrown in a library not managed by the solution). Please see my support question on the subject, and check out the video's for a compact description http://forums.xamarin.com/discussion/comment/50034.
I do not know what circumstances trigger this, but it happens on all projects, even newly created ones. I'm having a hard time figuring out what part of my code is making an exception happen due to this.
I have checked this issue and able to reproduce this. To reproduce this issue I have created a sample project(), implemented the code to throw exception and got the exception below :
System.Exception: Exception of type 'System.Exception' was thrown.
at bug_18948.MainClass.Main (System.String args) [0x00001] in /Users/MM/Projects/bug_18948/bug_18948/Program.cs:10
Screencast : http://screencast.com/t/nSvHDqYM
Mac OS X 10.9.2
Xamarin Studio : 4.2.3 (build 60)
This works on Mac but fails in Windows, so *probably* a CorDebugger issue
The simplest repro case is to call File.Open() on a non-existent file (as Gr.Viller illustrated on the forums)
Fix will be available in an upcoming release. Thank you for reporting this.