I have the exact same problem... I have read foolofthehill's response and followed the instructions. I forwarded my port @ portforward.com instead and that also stopped the firewall from blocking Limewire. Even after I have disabled the firewall, nothing changed with the "Need More Sources" problem. I'm also unsure whether or not I should enable the UPnP. I currently have the "Manual Port Forward" checked (Tools->Options->Advanced->Firewall Config)
Could anyone help?

Thanks,
-Xephyroth