We recently changed from AFP to CIFS for our MAC clients.
This works a lot better for us, but we did find an issue.

We use certain folder for students to put their assignments in. They can't have read right because they can copy eachothers work, so they have write, create, and filescan rights. This used to work with AFP, but now with most filetypes they get an error stating they don't have sufficient rights. the file is created but it is 0 KB. For example .ppt (powerpoint) files work but .doc (Word) don't. None of the Adobe filetypes work (.PDF .INDD .AI .PSD).

We use:

Netware 6.5 SP6
Cifs Version 3.25 8 August 2007
Mac OSX 10.4.11

Is this a known problem?