I've been investigating an android app that should handle gcm messages but somehow didn't do it after the app closed.
Used android studio to start debugging the app setup of gcm worked, closed the app - message was not processed by app.
Tried it again and started the app from phone closed it. Now the message gets processed.
Tried this for four days with workarounds, intensive researches even opened a ticket with Google for this but no luck.
... effin gcm ...
Today I eventually realized that when I started the app from android studio for debugging and closed the app then gcm apparently breaks and cannot handle messages anymore...

So I essentially wasted 4 days debugging a bug that only occurred because I debugged the app... *argh*

YOU TUNAHEAD 'ROID STUDIO!