Autocad 2013 Network Install on Win 7 64-bit lose all network server connections

[Anonymous]

Installed License Manager and Autocad 2013 on New Server  running Windows Server 2012 R2.

Created a 32-bit and 64-bit Autcad 2013 network deployment

Successfullly installed on client system, but as soon as I open Autocad on teh workstation all the mapped drives are lost

I am not even able to browse to the server.

I have to exit Autocad.  Restart teh system to get access to the mapped drives.

The main server has the License Manager installed on it.

I have the same problem on an old Windows XP 32-bit system, and a brand new Windows 7 64-bit system

Can someone help me with this?

Thanks