You may want to delete your previous 'preference' file and see if that changes things.
This file can be found in you 'user' library>preferences>com.limegroup.gnutella.plist.
Just deleting the Limewire application doesn't delete all the files. Unfortunately OS X scatters files all over...
I also recommend acquiring a system utility like 'DiskWarrior' to fix any problems with OS X.
After deleting the 'preference' file, try installing an older version of 'Limewire', and make sure it's the one for 'Intel Macs' (Universal).