Did you find a solution?
I am seeing the same problem. PR was configured using the wizard, it is running in Weblogic, and we are following the post install guide for PR post installation tasks.
http://test101:8204/pr/admin/login brings up a request for the privileged username and password but nothing works. This is not unexpected since per the guide, the "Configuration tab" is supposed to appear but does not. That means that it thinks it is configured when it is not. I have tried interrogating the files under; D:\P6EPPM_1\pr.
I can click on "Click here to administer timesheet application settings" and login as an Admin Superuser. Trying to log into PR directly (not through administrator) fails, not authorized user.
Time for a service request unless there is a quick answer.