When I upload a video to YouTube, I get weird artefacts and a strange rainbow abnormality. I'll provide a few links to show what I mean.
Now, the weird thing is, they don't appear when I'm just watching the video from the hard drive; only on YouTube. This only happens to videos that have been edited in VideoWave, though.
http://www.youtube.com/watch?v=NkQrffybaSM&list=PLNqFju0fgYcTK3INCoM9SmeOgeC3V9p3C&index=4 - 3:17
http://www.youtube.com/watch?v=pj5JO-lLJLc - 1:57