So I had same errors as dd, and after lots of sourcemod reinstall and testing, I found something.
If I launch the game in window mode and then load a map, everything works fine.
If I launch the game in window mode, change resolution or go full screen, then load a map, I get the same errors dd posted and nothing works.
If I launch the game in window mode and then load a map, everything works fine. Once everything is loaded and working, if I try to switch to fullscreen, my game crashes.
If I launch the game in full screen, nothing works no matter what.
Idk what's causing it tho, maybe something with my configs...