After a successful login users see they map drive as disconnected. When they click on a drive the access is given.
It seems it start to happened after some Windows Updates.
The issue occurs also with the last version of the Novell Client.

There is no Windows in-place upgrade as described in TID 7013477.

If I run Setup.exe the problem disappear after a reboot. I would like to find another way to solve this issue because hundred of workstation can be affected by this issue..