You got game! Itried every thing I could find, renameing gnutella.net, deleting folder .limewire, manually port forwarding, kill firewall, kill antivirus, deselect ultrapeers, and all the rest. The damn tip of the day was the culprit. I write software, and I can tell you there is no discernable reason this should have anythiing to do with a connection problem. I too bought the PRO hoping to connect after diminished performance with the free version. I am discouraged to see several instances on here where tech support doesnt answer emails. I am also discouraged to see the same problem I had, not solved very often, or a dead thread. For the record, I tried all I listed above with no luck and the tip of the day turnoff was the trick. For others, my config is:
HP laptop running XP pro sp2
Verizon broadband access card
Windows firewall
AVG antivirus

Thanks. By the way I too got a turbo connection when it started working.