<video> tags have a tendency to be... "iffy" with their mouseover controls (sometimes, they appear and then promptly disappear, and several more issues exist). This can get rather annoying, and is seemingly-randomly reproducible.
I can't find a good way to make a testcase for this, as it seems to happen for any video at any time with any configuration, randomly. Sometimes, the controls appear on mousein but disappear again 1/2 a second later, then do the same on mouseout. Even though they're hidden, the pause button at least still seems to be clickable.
Screen cap of the issue in action: http://rodgercombs.webhop.net/bug.mov Further regression tells me that this issue only occurs with Perian-based videos (it's possible that it's just FLV, but I think it's all of Perian), but I can't see how a Perian bug would cause this graphical issue.
Created attachment 60845 [details] Screen cap of the bug in action