What would cause an OU to be invisibe until after login.

At login you can't browse and select one OU. All other OU's are visible. If
you type the context in the client context line, you can login. Once logged
in, you can see the once invisible OU.

Existing config.: 2. ea NW 6.0.5 servers. Each server is in a seperate OU.
The server in the initally invisible OU is the Master or root. We've ran
dsrepair with no errors. dstrace +schema, +blink and sync all work without

We installed a new OES on NetWare w/SP6 into the afflicted OU successfully.
However, during the install the OU was invisible until after logging in the
the tree.