The issue with the AutoCAD compatibility is apparently the way the users are locked out of specific files - there is a specific type of "sheet set" file ("xxx.dst") which is unable to be accessed by anyone but the author even when the file is closed, and it becomes a problem when more than one users need to work on the project.
We tested the theory that it was a server issue by creating a new project on a shared drive, and did not have the same issue as projects created on the server.
The Server is Linux using Samba.
How can I change the lock?