Im having a bug on Gmod thats is blacking out all texts

Ok, im having a problem with Garrysmod(which is my life) and it just kills me when it happens. I join Public servers good just every id say, 3rd server i join without restarting gmod shows text blackened out and it can also be texts and pictures on props. I dont know what could be causing this so if anyone can help, PLEASE HELP ME!
Its been going on since gmod 13 came out, on 2 computers i had that had nothing of the same parts or anything. Just if it could be my graphics card ill list what it is.

Graphics card: Nivdia 9600 GT

Screenshot of Blackout text and prop pics:

PLEASE REPLY QUICKLY OF WHAT YOU THINK’S CAUSING IT!

I don’t have a solution perse, all I can add is the only time I experienced this was when my graphics card was physically dying.