Which OS are you using & which version of LW? Somebody who posted in the developers' forum had this problem when using the latest version (5.4.6). Click on this link to see their thread:
LimeWire Forums
If you want to try the earlier version of LW which works for that poster, you'll find a link to download 5.3.6 here:
Old Version of Limewire 5.3.6 Download - OldApps.com
Or you can post over at the developers' forum (need to register first) & see whether they have any more ideas.