Thanks for taking the time to report this and welcome to Ubuntu! Lets try to narrow down the problem to the proper package since, like you said, its probably not firefox. In a terminal type the following command and then try playing a video again.
metacity --replace & exit ** Changed in: firefox (Ubuntu) Status: New => Incomplete -- Flash player crashes (blank area) on Ubuntu 10.10 https://bugs.launchpad.net/bugs/666755 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs