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Created attachment 4078 [details]
Shows exactly what is broken in the IDE
When 2 or more instances of Xamarin Studio are open the tabs stop responding to clicks. It seems to happen most when the same file is being viewed in both instances. You can still switch between the tabs using the little drop down menu in the right hand corner of the tabs section. It is also possible to get the entire tabs bar to stop functioning if you save a change to a file that is being viewed in both instances. The only way to work around this is to restart both instances.
Steps to reproduce:
1) Double click Xamarin shortcut to open an instance.
2) Repeat step 1 to open the second instance.
3) Open the same C# class file in both instances.
4) Notice that now one or more instances' tab menu no longer responds.
5) Save a change to the C# class file that is open in both instances.
6) Notice that all functionality is lost in the tab bar.
Reproducible: ~ 4/6 (Not specifically tested for, simply noticed during normal use)
*** This bug has been marked as a duplicate of bug 10790 ***