Let us know if deleting the LW prefs folder fixes it or not. BTW the new version is LW 4.12.11 ... easy mistake to make.

Airports have the option of port forwarding or a NAT-PMP mode that's roughly comparable to UPnP mode. If it's not working reliably in that mode then port forwarding is the way to go; Apple Airport Extreme/Express for Mac users * (NAT-PMP)

I have deleted the prefs folder and matched port numbers in the system prefs and in LW prefs. I am now getting 3 green bars instead of 1 and a fair connection instead of starting connection. when I check the connections, I am only getting one which is probably why I am only getting a fair connection. search results are slow and I haven't yet been able to download anything successfully.

I am wondering if there is a list of hosts that I can access to manually add under the connections window.

Many thanks o Gandalf the LWise

Pal