Win7 load, on the domain. Group policy has the RDP settings active. Accounts are in the domain built-in group of Remote Desktop Users (i had a different question on that one that was answered.) Computer is in the same OU as my member servers and receive the same policies for RDP. I connect to the box, credential window appears, I use my credentials and get the error: "To log into this computer you must be granted the Allow log on through Terminal Services right....." The settings are identical between the servers I can and this one workstation I can't. At least every setting I can think of.

Hello. I have seen this and removing the users then re adding them to the group resolved the issue for me. Hopefully it will work for you too.