Reinstaller the flash plugin, and restarting firefox solved this issue for me. I'm using Ubuntu 9.04 64 bit and upgraded from Ubuntu 8.10 64 bit too.
$ sudo apt-get remove --purge flashplugin-installer flashplugin-nonfree $ sudo apt-get install flashplugin-installer flashplugin-nonfree
Reinstaller the flash plugin, and restarting firefox solved this issue for me.
I'm using Ubuntu 9.04 64 bit and upgraded from Ubuntu 8.10 64 bit too.
$ sudo apt-get remove --purge flashplugin- installer flashplugin-nonfree installer flashplugin-nonfree
$ sudo apt-get install flashplugin-