Why, When I'm Logged On, Doesn't My User Name Show Up In The 'Who's Online' List?

It happens with me also. The possible reason is that the 'who's online' section is not updated when we refresh the page. The problem is with  some script. The script sometimes delayed by the server. If you would try after sometime then you could see yourself online.

As far as i know it, the name shows in the online list. But you need to log on everytime from the start. Try signing out first and then signing in again, i hope your name will appear then. It happened to me as well and i did the same.

I think my experience the name comes a bit later after login.