As I said before, the admin CP section of this is not yet perfect - it works, but is not perfect. I'll work on that when I get some spare time.
However, regarding your two other problems, I really can't help you i'm sorry to say, everyone else I know that has edited the online.php file have had success with it.
As for you being logged out of the admin CP, the admin part of the hack does not make any changes to being logged in or out, it uses the normal vB security features, so I can't help you there, sorry