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[King Kickass]

hmm, well i'm no expert at this sort of thing so, i guess you're going to have to try everything.
Try  validating Gmod.
If you installed any Gmod addons in the a short period before this happened then uninstall them and see if it continues.
Try messing around with the graphics settings.
If none of these work then it might be a sever side issue, because i also experienced the police officer model spazzing this morning so something might be up,  hopefully something works anyway.

All the best

NOPE, Not working

In that case it must be server side. if you get desperate for answers though you could still reinstall Gmod 
set launch options to -autoconfig
if that dosn't work. then it must be a bug from the server side.