If the error appears before the logon screen, then it would be the Application Start Rule that shows 'This Section is Closed'.
In the associated rules for Application Start, Logon, Logout, etc that use the Pole Display, you can set a condition 'Terminal Name != TABLET' so the rules will not work on the Tablet, but will on other terminals.
Sorry, but it has been a while since I had these issues when using RDP.