Can’t add AD Users/Groups into OD Groups

I'm running the Magic triangle and I can't add AD Users/Groups in OD Groups. Once a user/group is dragged into the appropriate pane in WGM, when "save" is clicked, the users I dragged in dissapear. Anyone got any ideas? OD Master: 10.4.8 PPC (XServe G4) AD Master: 2003 R2 10.4.7 Server Tools TIA