Hey, i have googled my problem without finding any solution.
I made my own background… i saved it in 1680x1050
and named it background01.vtf and it kinda works…
you know when the little blue bar shows up when gmod is loading,then i can see my background, but when gmod is fully loaded it changes back to normal background… I have 16:10 aspect ratio,found on google that one person had same problem but it was unsolved .
Please help me