I would recommend 3 things:
1. Update your Java (see tip in link below in point #2)
2. Delete your LW preferences folder whilst LW is
closed. See points #1 & 2 here
Fixes for Limewire (sample images of how to delete your LW prefs folder at bottom of page!)
3. Reinstall LW using the newest version which has fixed some small bugs (choose the "Offline" installer version!!!):
http://www.limewire.com/english/content/download.shtml