I've experienced the same problem with DivX in Virtual Dub. I didn't have this problem until, I think, version 5.0 or DivX. I can't export properly at my preferred high quality settings. If they're acceptable to you, you might try the "default" DivX codec settings. Unfortunately they don't yield the highest quality results, but for smaller animations that will be displayed on a computer, they'll do. Default settings in my experience don't cause the no-video problem. I've also used the XviD codec as a trouble-free substitute, but it seems that use of that codec is not very common.