[HELP] GMOD Causes Desktop Resize

So, if i alt-tab for more than 30-40 minutes to map and compile, if i un-alt tab, then the screen is black and if i CTRL - ALT - DELETE it resizes my desktop to what it looks like below.

It takes 4-5 minutes before gmod gets backup and resets itself and then i can do everything as normal…

Has anyone else experienced this?

NOTE:
This only happens if i begin mapping and compile, does not happen if i regularly alt-tab for a while.

Run Garry’s Mod windowed. To make it look like full screen, change your launch parameters (in game properties) to:


-windowed -noborder

Thanks, that seemed to help a lot!