If MPF crashes for whatever reason (e.g. invalid config), the Unity editor will get stuck on domain reload next time play mode is entered.
To reproduce:
Enter play mode with an invalid MPF config (MPF will crash immediately)
Exit play mode
Attempt to enter play mode again. The domain reload will never finish. You are now stuck :(
If MPF crashes for whatever reason (e.g. invalid config), the Unity editor will get stuck on domain reload next time play mode is entered. To reproduce: