Upgraded Thunderbird/Lightning to latest - Thunderbird does not respond and appears to hang.

I believe this has to do with the calendar that is currently enabled in Thunderbird using Lightning.
Unfortunately, uninstalling/reinstalling lightning, Thunderbird simply hangs when it restards and is "Not responding". Disabling all Add-ons enables you to check email. Is there a way to disable the current calendar, reinstall Lightning and set-up a new calendar? I suspect the current calendar is google based.

Hey Tony,
It appears it was the Airport settings and the router. Here is what I did.
I opened the ports you listed on the Linksys router using port range forwarding. I did not add the jabber ports because I'm not using Jabber and Linksys apparently allows only 10 ports (or port ranges) to be forwarded. One of them is forwarded to my apache server which I did not want to change.
I forwarded the ports to 198.168.1.1
The Apache server is forwarded to 198.168.100
I unticked the iChat I added in the sharing/firewall. The original iChat/Bonjour setting is still ticked on.
I finally found the UPnP setting on the Linksys router under Administration/Management and enabled it. What I had enabled (and then disabled) earlier was the UPnP forwarding under Applications&Gaming/UPnP Forwarding.
While looking at the Linksys settings under "setup" I saw that the the local DHCP server is set to start addresses at 198.168.1.100 So I tried setting the ports to forward to that address instead of 198.168.1.1 No luck. So I set them back to 198.168.1.1
Finally I went into Airport and turned off the port forwarding as suggested by Ralph's note that you attached. That solved things.
So I'm not sure if it was the last thing I did or a combination of all. Thank you for your help.

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