Old Domain Name appears in My Network Places

We used to have multiple domains with trust relationships in several site offices back in the NT days. Now we have a single domain where all of the DCs are in one office. We still have site offices – just no remote servers.

Problem is that on occasion, I see one of the old domain names in My network places when I browse the network. I double click on it and I get “DomainName” is not accessible. You might now have permission to use this network resource. Contact administrator (me)….blah blah blah.

There are no servers connected. When I look for the “name” in DNS and WINS I do not see it. There are no trust relationships defined. What could be causing this? Any ideas at all?