The elephant never forgets

I have a domain contoller & 4 Citrix servers(NT46a-MF1.8). I recently changed the logon scripts to use another “M” drive. Now I’m having to login as every user and disconnect the old “M” drive, log out and back in before the new “M” will show. I’vetriple checked all my scripts, my BDC scripts, sync’t my domain, What else???