The CID of all users are being corrupted to "unknown" in the shared folder on the windows 2012 server.
When a user with a Mac Mountain lion client stores a file/project in the company share folder something strange happens. The owner rights of the files changes. It is impossible to access the file from the client, because the CID of the domain user is not there. I can open tihe file on the server by usin admin rights, and the file is ok.
If I try to save a word file from the same client everything works fine.
The system is running ok for about 14 days, then suddenly ALL the mac clients experience the same problem.
The Compter and users are correctly integrated in the domain and shares, printers works fine.....