Hello. Yesterday I updated to Windows 8.1 and Garry’s Mod has been in the Red/Cyan 3D ever since. I didn’t change any settings. I have tried to verify the game and it says 1 file has been replace, but when i relaunch the game it still shows up in 3D. I tried to re-verify again, and it still had to replace one file.
Thanks for reading!
SOLVED: Ctrl+T Fixed it