Mouse Flickering?

Oddly, when I switched my Garry’s Mod video settings, it started to do this weird flickering effect.

It seems to only occur when I am trying to play the game, however in the menu it doesn’t happen. I can’t look around, or do anything involving my mouse.

I’ve tried reinstalling Garry’s Mod, Unbinding and rebinding everything, changing back and forth to the video settings, nothing worked.

any ideas?

https://www.youtube.com/watch?v=Uw_Oe8LcB9o

This shows what I mean.

Looks like one of your addons cause this. Make sure your server/game is updated to the latest version.

Mistake on my part. I was doing a panel and had left it unfinished and being done in a weird way.