Klassic,

Do that LW port test again.
http://www3.limewire.com:6346/
Are you using PeerGuardian2? If you are, just make sure that PG2 isn't blocking access to the site (open PG2 & watch what happens when you try to connect to the test site).

If the test still doesn't work & it's not a PG2 problem, try changing ports. In LW tools > options > advanced > firewall config. Change LW's listening port to 65000 > apply > ok. You can also try other ports in the range of 49152 - 65535.

Go into LW's preferences folder (LimeWire) & find your gnutella.net file...hover your mouse over the file...what size is it?

Did you ever try port forwarding? Even though you didn't have to use it before, it's worth a try if you're determined to use LW...the specific instructions for your router are here.
Port Forwarding for the Motorola SBG 900
Don't forget to set up a static IP address first. LW's listening port, port in the 'manual port forward' box & port forwarded within your router's setup should all be the same number.