I have a Windows 7 64 bit computer and just updated to Firefox 12. Whenever I try to play youtube videos or embedded videos, I get green screens. If I hover the mouse over the players timeline, it will show me what is SUPPOSED to be playing there in the form of a small preview- but the main screen stays green. I've uninstalled and reinstalled Flash 11, updated Java 6 v31, reinstalled my video card drivers (Radeon HD4650) tried new codecs and plugins for firefox and still get the same results. Any ideas on how I can fix this?
It might be a corrupt flash install. They provide a tool to cleanup flash. I've had this happen before. You would think that uninstalling from the control panel's add/remove programs would be enough, but sometimes it doesn't get it all.