Garry's Mod Not Opening - Mac/PC

Yesterday everything was fine but now when I try to play GMod it opens for about a second says its not responding then closes. I have re-downloaded the game and looked at the game files and cant figure out whats wrong. Is this happening to anyone else or just me?

I realize that someone else just posted the same thing but im not sure if it is just on Mac or PC as well :confused: + I did not realize that someone else had just posted the same thing Sorry :frowning:

When you created this thread the top thread was about the same issue.

I know, Just noticed that… Ooops