Motion Blur Problems.

So I like to play Underdone, which requires Motion Blur to be off. Everytime I start up GMod however, Motion blur turns itself back on because of the “best settings” for my video card. If I change it and hit “apply”, my GMod will crash 50% of the time. Then if I try to join a different server (non-UD) without turning it back ON, then I crash 100%. Is there any way to fix this annoying problem?

Go to your cfg folder , and create a autoexec.
Type this in the autoexec :
mat_motion_blur_enabled 0
Then save it as a .cfg