Multiple workgroups – one doesn’t work right

This is a very bizarre situation
1.) The network I am dealing with is a peer to peer with approximately 80 computers (I know, don’t ask!) using Windows XP SP2.

2.) It has 5 workgroups we’ll call A, B, C, D and E.

3.) I can configure the PC to be a member of any of workgroups A through D and can navigate to any of the other workgroup except for E.

4.) If I make the PC a member of E, it can’t see E or any of the other workgroups.

Any ideas?

Thanks,

Rich