Well, Felix 10, did say something about only seeing the Modification worldets(which is odd) meaning the people can get in, in turn meaning it's just a cp_common problem.
The only way i see it, if the user numbers are initalized correctly, is the the var admin_number is not set/correct. Felix 10, are you sure you have the 'var admin_number = "$admin_number";' above the if statements in the javascript in that file?