When removing a drive mapping from the vWorkspace console by unassigning it from the user, the mapping is not removed from the pnshell.ini. This then conflicts with drives set using Active Directory, resulting in no drive being mapped.
Unassigning Drive Mappings from a user does not remove the drive mappings from the %userhome%\pnshell.ini file.
Edit the %userhome%\pnshell.ini and remove the Drive Mapping.
Defect TFS178744 has been logged for this issue and it has been submitted to development for consideration in a future release of vWorkspace.