startmovie avi causes me to close gmod

Everytime I use startmovie [insert a name here] avi, it goes onto usual loading. But after 5 minutes, it doesn’t pop up unless I press the windows button. But when I try to go back into Gmod it won’t load causing me to ctrl-alt-delete

Same here, it crashes my GMod. You’re probably better off recording over a demo with Fraps or something. That’s what I do.

What the fuck has Garry done in this update now to crash it?