I started having problems yesterday. Ever since then, I can't watch videos on Youtube anmore. My Adobe Flash plugin crashes every time. I've taken a look at the list of crash reports mozilla porivdes, and it always gives this signature: Quartz_DllGetClassObject The crash reason is given as:EXCEPTION_IN_PAGE_ERROR It's the same in Safe mode, and the problem persisted after I uninstalled and re-installed my Adobe Flash plugin as well.