This might be a bug for some people in the latest versions of LW. Have a look at this thread: LimeWire Forums

You can either

(a) Try the latest Beta, if you don't mind using a Beta version which might have some bugs. More info in this post: http://www.gnutellaforums.com/downlo...tml#post343730

(b) Revert back to 4.18.8 & see whether the problem is solved. You didn't say which version of LW you were using before you updated, so without knowing that then best I can suggest for an older LW is 4.18.8. There's a page to download old installers: Lime Wire » Download Out-Of-Date Installers

If you're using Pro, your personal download page has a link to 4.18.8 on the left hand side - 'Get LimeWire Pro Classic'.