master.php should only allow one admin level, power.php should allow two admin levels. I can't get in to master.php at all regardless of how I've signed in, and power.php doesn't seem to matter what level I sign in with.
master.php is set to 3 (Logged in to tbl_admin Master Admin Users - in group Master admin users)
power.php is set to 2 and 3 (Logged in to tbl_admin Power Admin Users - in group Power admin users)
all pages with admin in the name are now set to 1, 2 and 3 (Logged in to tbl_admin - in group All admin users)
The admin-named pages were set to Power Admin Users, but all administrators could view them regardless of their access level. I have changed it so it's should be easier for you to trouble shoot, or at least I assume it will be easier.