From experience I think maybe the best thing to do in those situations is close LW. I had a similar error with the beta recently & it's mucked up the icons for the files ever since. My guess is deleting the LW preferences folder may help to fix this. 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.)