Are you using OSD or PROVISIONING? Which OS are you deploying? When you join the domain are you also needing to put the machine in a specific OU?
This will occur during OSD or provisioning. My Method moving forward is provisioning so i am currently looking for an option to fix it while provisioning.
No I put the machines in the deafult OU.
What we did was not use GPO for the logon banner and set the banner with a script after imaging/provisioning. We used the same registry setting as the GPO. I will post the script tomorrow when I have access.