Try these things:
1. Delete your LW Preferences folder whilst LW is
closed; instructions here:
Point #3 in Fixes for Limewire (sample image included 2nd last post of page.) And remember to move your Downloads file out of preferences folder before doing this. Return it later whilst LW is closed after step 2 below.
2. Download & install the LW beta:
LimeWire 5.6.0 (Beta) - Lime Wire _____ (Details of LW changes:
Changelog - LimeWire)