We just released an updated Windows build of the Net Control release that includes a fix for using domain groups when PaperCut is running on a member server. The problem was that PaperCut was only listing local groups in the setup wizard, so domain groups could not be used. If you were running PaperCut on a domain controller then the domain groups will list correctly, and there is no need to update.
You can download the latest release (Build 3816) from the Net Control module testing page.