XP Pro RDP to W2003 Terminal Server

I am connecting a mixture of 98, and XP pro clients using RDP to a W2003 server running Terminal Server, DNS, DHCP, File and print, Active Directory. All clients have the same security and profiles. The 98, 2000 and some XP Pro clients are working sharing local resources through terminal services ie printers and hard drives.

I am having problems some of the XP pro clients with their local printers being available whilst running in the Terminal Services window. I have checked the relevent boxes in the RDP setup and can see the local Drives no problem but can not get the printers. Has anyone had this problem before and do you have any suggestions ?