I have a new 2008 R2 Terminal server running in a 2003 domain with a group policy assigned to map network drives at Log-on via a VBScript. The Policy is applied to my test OU and works flawlessly when my test account is a domain user. If I make the test account a member of the domain admins - the policy is processed (confirmed via GPResult), but the drives are not mapped at log-in. If once logged, in I manually run the VBScript, the drives are mapped successfully. I found another Experts Exchange member who had a similar issue and the case was closed with his response of "Admins get different profiles than Users".
*Domain Admins is currently a requirement for accounts accessing this terminal server, removal is not an option.