I'm having trouble loading the cp_ and pl_ maps on Gmod since the update. When I try to load them, I get about half way through before it crashes and windows gives me an "hl2.exe has stopped working" error. How do I report this bug so that it can be fixed?

ADDED: I just tested the koth_ maps and they aren't working either. It seems that any map that involves a control point or payload crashes before it could load fully. Only the ctf_ ones seem to load.
Here's the list of the map types that won't load:

arena_*.bsp
cp_*.bsp
koth_*.bsp
pl_*.bsp
plr_*.bsp
tc_*.bsp