How to make Flash full screen work in Ubuntu Hardy and Firefox

We were using the Flash applet on Livescribe's web site in Firefox running on Ubuntu Hardy. We were using Flash 9.0 r124, and Firefox 3.0.7. It had a full screen button, but nothing happened. It was strange, because the full screen button worked a week ago. I've found a solution on http://ubuntulinuxtipstricks.blogspot.com/2007/12/fullscreen-youtube-now-available.html :

If you're using Compiz Fusion, turn off "Unredirect Fullscreen Windows" in the General section and turn off "Legacy Fullscreen Support" in the Workarounds plugin. If you don't, the controls for the player get cut off.

We've found the settings above in our Gnome desktop > System > Preferences > Advanced desktop effects > General options. Turning both settings off solved the problem for us.