gandolff try deleting your LW Preferences folder whilst LW is closed; instructions here:
Fixes for Limewire
Then give it some time to connect. Even up to an hr. If this doesn't work, go to Tools>Options>Connections & untick option & press apply. Then go to File>Disconnect. Wait a minute, then go back & select connect.
SoCoNFuSe
try the same thing.