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"Access Denied" Login Error
I had a problem where if you accidentally entered an incorrect useraname or password to access the admin area you were given an access denied error.
A cookie was set and you would continue to get this error until the cookie expired or was removed.
To fix this problem in scp/admin.php on line 19 change:
if(!$thisuser or !$thisuser->isadmin()) die('Access Denied');
if(!$thisuser or !$thisuser->isadmin());
You still get an Invalid Login Message when you mistype a username or password but it will still let you try again.