Comment 14 for bug 231679

I've seen this for months too, using 64-bit Ubuntu 8.04 (Hardy).
(Intel, not AMD)

Once the situation starts, it seems any flash you try to load will have this problem, until you restart firefox. Usually I'll get some youtube URL sent to me, click it, youtube will come up - with an empty box instead of the video player. I'm not convinced it's youtube's player, but as someone said above, probably something else that hung the flash plugin.