Fullscreen video (youtube, gvideo) closes while playing

[emerick7]

Whenever I fullscreen a video (at least in youtube and google video), about 30 seconds or so into it the video goes back to the normal size in firefox 3.0.4. In other words, I can't watch fullscreen.

Any ideas? I've tried a few things that some searches through the forums came up with but to no help (they didn't seem like they were having the same problem though).

Here's what I get with locate libflash:
/opt/openoffice.org/basis3.0/program/libflashli.so
/usr/lib/firefox-addons/plugins/libflashplayer.so
/usr/lib/flashplugin-nonfree/libflashplayer.so

and about: plugins:

Shockwave Flash

File name: libflashplayer.so
Shockwave Flash 9.0 r124

MIME Type Description Suffixes Enabled
application/x-shockwave-flash Shockwave Flash swf Yes
application/futuresplash FutureSplash Player spl Yes

Thanks!

[emerick7]

Any ideas?