Thank you, Todd.
Actually, just found the answer here: http://forums.adobe.com/thread/638307
I don't know why I didn't think of trashing the preferences, but it worked.
(For those looking for how to trash prefs, just go to Users/XXXYOUR_LOGIN_NAMEXXX/Library/Preferences/Adobe/After Effects/10.0/ and delete the file there (or rename if you'd rather) AE will rebuild it on startup.)
Thank you, Matt-v!! you just saved my life!!!