Text Problem with iTunes and Firefox

Hey all,
I've been having an issue with the fonts used by iTunes and Firefox. It is probably caused by an overwrite of whatever font it is. Anyways, it makes the majority of the text used by the applications look like asian characters.
Does anybody know what I should do to fix this? What is the font name? Maybe I can just replace the font in the fonts folder.

Thanks.

Firefox:
iTunes:

hello

im encountering the exact same problem...

Folks, see if this helps: http://www.apple.com/pro/tips/badfonts.html

Noel

Might also be a bad font cache try that first with googleigook fonts like that

MainMenu allows you to clear font caches