Tried it on my home PC running Win7 and the latest Firefox and FlashPlayer. Still having the "jumpy video" problem playing YouTube videos. On my Win7 machine at work (that plays videos fine) we can't download the latest version of FlashPlayer from Adobe, it's blocked by the Powers-That-Be and we are forced to use an older version, version 10. Version 11 on my home PC is jumpy, so maybe the latest version of FlashPlayer has a bug. IE works fine with the latest FlashPlayer at home. Oh well, such is life.