Hi Dragon
Try a clean install (run the uninstall and use the finder to search for the preference files--"limew" usually works for the search term-- that the uninstaller doesn't touch). A fresh download and install should fix the problem.
if not, try Jens-Uwe Mager's build of LW for OSX
http://baghira.han.de/~jum/LimeWire.html
If neither of those ideas work, post back and someone should have some more ideas.
Cheers