first you should read the following, to make it the others possible to help you with your problem.
At all there are not enough information to help you especially with your games problem. What games? Via steam or lutris or something else? Why did reinstall manjaro and do you use you old home-directory?
To get the celluloid-problem closer start celluloid from terminal. Then you can probably see any output which can give you a hint to the problem.
