Invisible Youtube loading bar for Firefox 5.0.1 (9/14, it fixed itself?)

Small update: Running in safe mode oddly fixed the buffering problem, but now the loading bar still doesn't show up. Essentially, it's not buffering if I jump back to a previously loaded section. So I can hop around sections of fully loaded videos without a problem now, but now I don't know how MUCH of the video is fully loaded. Fixed one problem, and another still remains. Gonna see if another Safe Mode will somehow fix the whole thing. *And nope it doesn't. Now I have an invisible loading bar. =/

*Also edited title to reflect new problem.