I was having a similar issue. The two things I did to fix this was:
(1) enabled “clear cache every time you close firefox” in Firefox browser options.
To do this:
[menu options – privacy – click “settings” under “always clear my private data” – check the box for “cache”]
(2) deleted Flash 10 under add/remove programs
Not sure which one provided the fix, as both steps have been recommended for fixing the problem, but this should fix everything if you are using Firefox.
I have the latest version (3.0.6) by the way.
