The manageusers.pm file should have the "our" declaration of $LoggedON_user_id and this "our" declaration should not appear anywhere else.

I am not sure what your remaining problem is, but I suspect that the solution will be simple once the problem is fully understood.

Again, try to make a very, very simple example of the problem. Forget the web server for the moment. Get your script to work from the command line.

Your "cgi" script doesn't even need to import $LoggedON_user_id as long as it does "use manageusers ();", (which imports nothing), you can still access $manageusers::LoggedON_user_id as long as manageusers.pm has something like our $LoggedON_user_id = "default";