GPP Drive Maps cannot apply to multiple session under Terminal Services

Hi folks,

A strange issue that I created a new GPO and configured the GPP Drive Maps policy, meanwhile I created a new OU then linked the new GPO to it.

I created a user in the new OU, then tried use this user to login to the terminal server (Windows Server 2008 x64 RTM, patched SP2), all drives get mapped prefectly, in this case, the session is 1, this computer is CLIENT01.

Then I went to CLIENT02, use the same user to login to th terminal server again, the session is 2, both sessions are online.

In the session 2, I cannot see any drives get mapped.

Then I log off from both sessions, next to login to terminal server from CLIENT02, this time, all drives get mapped like dream.

All then I got the problem, when I login to the terminal server from CLIENT01 using the same user account, no drive can be mapped.

What's the root cause of this issue? misconfiguration or known issue or something else?

I tested the scenario in Windows Server 2008 R2 Terminal Server, no such issue.