I view videos so infrequently that I forgot about it, but I've also had trouble recently playing them in Safari: I click on your link and the video appears with the "HTML5" overlay, but when I click on the pane it turns black.
I just played around a bit, and I found that if I control-click on the pane after it turns black and click on "Restore Plug-in" the video plays.
This behavior began after I installed the most recent Flash update and didn't get any better when I reverted to the earlier version.
More: I just opened your video in a vanilla Firefox, and it played immediately.
More "More": I just tried the control-click trick with a different video with which I had had trouble, and it, too, played.
Dunno what's up.
