I download vids from youtube and convert them on keep-vid.com. Then I drag them to the ipad (via itunes). I've done it this way since day one. A couple of days before I updated to ios4, a couple of vids I did this way did not show up as thumbnails of the vid, they showed up as white tiles with a comp monitor on it. I can touch them and they play the vid fine, but no thumbs. I then updated to ios4, and they still show up as white tiles. I deleted them and re-did the whole shebang, still showing up as white tiles.
Anyone else getting this, or can think of a reason/fix for it? I want my thumbs back!