monitor resolution bug

Having a bit of an issue here, I fired up gmod and changed the resolution from 1280x1024 to 1920x1080. As soon as I hit apply the entire gmod screen has just sort of not been there, for example if I’m viewing facepunch at the time and I fire up gmod, I’ll still just see the front page of facepunch as opposed to the gmod menu showing up, if I move my mouse around I can still hear the sounds the tabs make when it’s highlighted by a mouse, so I think I could still interact with it. I’ve tried deleting all of my gmod files and uninstalling it but that does nothing to fix it, when I reinstall it it’s just in the same state as it last was. Does anyone have any experience with this kind of problem or knowledge of how to fix it?

try adding -windowed to your launch options for gmod.