my permissions are not working...

my site is based on minecraft, and when i try to apply permissions to a thread, even when giving admins full access it tells them they dont have access to go into the thread.

could someone help me?
i did that and it still does not work of i am confused.
so set prmary group for all to registerd and secondary to any other groups? because i did that and it still of not letting them view the thread