Directory and Resource Administrator 6.x
Installing the Directory and Resource Administrator MMC via a GPO does not install the DRA MMC with the correct priviledges
The cause of this issue is that the setting Always Install with Elevated Privileges was not set on the GPO.
In the section titled 'Distributing User Interfaces with Group Policy' in Chapter 3 of the Administration Installation Guide, it details installing the MMC using a GPO. The setting Always Install with Elevated Privileges must be set on the DRA MMC installation GPO.
For information on setting the Always Install with Elevated Privileges see the Microsoft KB:
Published Program Setup Stops Unexpectedly