I'm a bit dubious of university connections. So many uni's block p2p. So you're lucky you can connect. With a wireless connection it sounds as though you're probably firewalled. Wireless devices often use an internal NAT firewall (or other type.)

May I suggest you try the new version of LW 4.4.4: http://www.limewire.com/english/content/download.shtml for the free version. Or your personal downld page for pro.