This errant Windows 2000 computer gets along fine with all the Windows 98 SE boxes but can't see or be seen by the other Windows 2000 boxes. I could see it the other way around, but this is kinda weird.
All the Windows 98 SE computers all can see all the computers on the network, 98 or W2K, and access any that have shares.
To check master browser problems we shut down all the computers and brought them up one at a time. No change at any stage.