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I found the problem. It seems I accidentally turned off the option to attach a debugger: [attach] Can be found under...
Completely out of the blue I can no longer attach MonoDevelop to Unity for debugging. I get the following error: "Could not open port for...
I can confirm this is still in 4.2. In our case it seems to lead to an access violation in the C++ code that causes the Unity Editor to crash.