We had a server crash over the weekend and reinstalled NetWare. Now when my
mac users connect, they enter their password and are presented with a list
of volumes to mount, if they select one particular volume they get an error

"Sorry, the operation could not be completed because an unexpected error
occurred (Error code -50)."

They were able to mount this volume prior to the server crash.
They can successfully mount other volumes on the same server.
I'm able to mount the problem volume if I'm admin equivalent.

NetWare 6, no service packs.

Other than applying service packs and update, which I'll be doing in a few
days, any idea what might cause this?

I've tried resetting nds/simple password, deleted sas entries from the other
tab of their user objects, tried logging in with full context.