Oops...
If you think this really should work and you can reproduce it. Then you should consider to report this problem to the Trac team.
Go to and create a new ticket where you describe the problem, how to reproduce it. Don't forget to include the python traceback found below.
Permission Denied
Note: See
TracPermissions for
help on managing Trac permissions.
TracGuide — The Trac User and Administration Guide