Try deleting your LW Preferences folder whilst LW is closed; instructions here: Point #2 & 3 in Fixes for Limewire (sample image included at bottom of page.) But make a note of all your settings because once you restart LW, you will need to reset all options, & LW will create a fresh set of Preferences.

If still no good, check Point #1 in above link about downgrading Java & how to do.