I’m using v2.1.3 Build 20101220.
I have the system folder renamed and running above the Webroot and the login page renamed. The only Add-on installed is Wygwam.
I have a Members group granted access to the Control Panel and a member assigned to that group—let’s call him Jim.
If I log out as a Super Admin and then log in as Jim I can get in and move around as I would expect Jim to be able to.
This also works if I am logged in as a Super Admin, view Jim’s account, go to Login as Member, choose Other and set the URL to my custom login URL.
If, however, I use the Login as Member function and choose Control Panel as the URL to be redirected to, I get a 404 with
The requested URL /system/index.php was not found on this server
(‘system’ used here as a placeholder for the purposes of this thread)