Garry's Mod screen problem

Hello. Everything about my problem is notifyable on video in link. I thought it was something about motion blur but changing it (enabled / disabled) change nothing. It happens only with this particular game. I have no idea what created this problem, it was running good for about half year now. None of “solved” threads around steam / facepunch forums didn’t helped me. I’d really appreciate any kind of help, thank you.
P.S.: Video is not placed in any promotional purpose, it’s only evidence of problem.

Link: https://www.youtube.com/watch?v=fsCIJl-p4PI

Go into Sandbox, post processing, and make sure none of them are checked. Look in effects too.

It worked, thank you so much for help :slight_smile: