OS X 10.2.3
Whenever I try to display the font pallette in Mail or TextEdit, it will do nothing (usually a box of fonts appear). It's only happened recently.
A check of permissions has done nothing to fix this.
Edit:
I also get this error in iChat when I try to set fonts:
Uncaught Exception
[NSCFString characterAtIndex:]: Range or index out of bounds
(Quit or continue are my options)