I've tried to upload an animation numerous times. Each time the file loads from 35-50%, then I get a message "IO error" and the upload hangs. Thought it might be file size so I cut the size in half, but I got the same result. The file is in vanilla AVI format and is just over 35 MB. I haven't had problems uploading stuff to YouTube so I'm pretty sure the problem isn't in my system.

Any suggestions? Thanks.