Clipper 5.2 & NetWare 6.5

My customer has an clipper point of sale application that they run on
a dos PC.  They're using BASE52 to reduce exe's size on memory.
Everything worked fine on their NetWare 4.11 server, but we upgraded
them to NetWare 6.5.  and now they're getting this error:

Unrecoverable error 415: Cannot open overlay file 'BASE52.PLL'

They get this on the dos PC when more than one person gets into the
application.  It appears to be a file locking issue, but I'm
unsure.    We have taken some file locking precautions on the NetWare
server.  We've set the following set commands:

Set Client File Caching Enabled = Off
Level 2 OpLocks Enabled = Off

Keep in mind that they're running the Novell VLMs on these
workstations since it's dos-based.

Any ideas or suggestions on how to resolve this problem?   The only
thing we did was upgrade the server that houses the database.   We
didn't change anything else.

Thanks in advance.

Matt Ray
MC Consulting - GroupWiseGuru.com
mray@[EMAIL PROTECTED]