I turned into a werewolf yesterday during the main quest and the video didn't show. I could hear the audio, but no video. The screen got fumbled up during the video which never showed, and then the game resumed. It wouldn't really bother me however after I slept for a couple of days and got visited by Hircine the video also didn't show, and it's hard to follow the main quest this way.

What's the reason? Morrowind's videos all showed up (in azura's shrine etc). How can I fix it?

Thanks.

PS: I've got MW + Bloodmoon and Tribunal, and my patch version is v1.6.1820. I also used Bink to open up the files and they all work.

EDIT: I fixed it. Thanks for all your help.