[OS X Emacs] aquamacs LaTeX mode

[Bob Frank]

Dear all,

I have inadvertently done something to my aquamacs set-up, so that now anything I type in math mode comes out invisible (i.e., it's triggered when I type a $ -- even the $ is invisible -- until I type another $).  It's truly invisible -- even if I change the background and foreground colors to black and white respectively, I still can't see what I type in math mode. I have tried to wade through the emacs customization system to no avail, and attempted to delete all of my preference files, but I haven't yet been successful in returning things to a normal state. Things are OK on another user account on my machine, so it's not aquamacs itself.  In the hope of fixing this, I would like to ask you all for help with the following:

1. Can you tell me everything I should remove from my home directory in order to be certain that my installation of aquamacs is completely clean? 

2. How can I reset the font coloring for math mode?

Thanks so much for your help!

--Bob