Ah, this just started happening to me today out of no where. Yesterday it was working completely fine all day!
I tried clearing the cache for the app, clearing the data and re-installing. Nothing worked. I installed version 5.51 and had the same force closing results.
What I am noticing is that I just updated SuperSU today. When I go into SuperSU, GameGuardian is not listed under the apps with root permission list. So, I made SuperSU automatically Grant root permission to any app and that still doesn't work.
Any help would be appreciated!
Thanks,
Joe