Two Mac OSX 10.4 users have problems with copying certain files to our CIFS

NW65sp4a servers - clustered.

Problem seems to be with .pdf files and .indd files. If we email the files
to a PC, they copy fine - at least with the Novell Client.

The Macs almost get done, then throw an "Unexpected Error Code -50"

My testing with SLES9 and NLD10 - no problems for the same files. Also no
problems for a Windows PC that did not have the Novell Client - using CIFS.

Any ideas?