Yes, one of the machines whose disk I tried to map had the extra protocol. I think this screwed up the DHCP IP Table on the router. And maybe one of the computers had the wrong workgroup name.
![Tongue :P](https://forum.avast.com/Smileys/default/tongue.gif)
Anyway, clearing the protocol, fixing the workgroup name and rebooting them all 2 or 3 times cleared it up. I'm happy to report that they are all working together nicely now. I can ping and map everything to everything, including any computer running the BART.
I plan on purchasing the BART CD in the very near future. I am moving to NYC in Feb and, hopefully, will be using it a lot there.