I’m trying my best to get Youtube and a few other online TV sites to play nicely with Ubuntu. It has been a minor headache. The thing that never seems to come up in any of the how-to’s is Hardware Acceleration.
Right-click in the flash window, and disable hardware acceleration.
What’s that for? It’s not as though Flash is doing high-volume hardware texturing and lighting. Bizarre.
Update: My big malfunction with Flash in Ubuntu stems, it turns out, from Stumbleupon. When I disable the Stumble toolbar, Flash plays nicely.