My game causes Unity 5.3.4f1 to lock up

When running my game in the Unity Editor, it causes the exe to lock up and the Unity process has to be killed (via taskmgr). Nothing is logged in Event Viewer, so I’m at a loss on how to fix this. I can’t attach MonoDevelop to the Unity editor either.

Any ideas ?

You most likely have an infinite loop somewhere in your code. What was the last thing you added that caused the behavior? That would be a good place to start looking.