I got some trouble with my trimmer/timeline in Sony Vegas Pro 9.0 just now. The picture in the movie I'm using suddenly won't show, only the sound. The same goes when I drag it to the timeline. It worked just fine earlier today, and there's no problem when I use shorter videos, like trailers. The movie is in .avi format, could it be that I don't have the right codecs? The trailers I've tested are also in .avi, but they work fine.
Any suggestions? I'm kinda noobish..
Thanks in advance