Hmm--the last versions of LW (4.9.28 - 4.9.33) have been fine with OS 10.4.2
So, . . . check the LimeWire->Preferences->Saving box to make sure LW is saving to the disk with all the free space.
Otherwise (or in any case this is a good idea), try the OS X basic troubleshooting steps (safe boot and repair permissions). Details are in step 2 of
http://www.gnutellaforums.com/showth...threadid=36374