Looking at your forumhome, you don't have the Whose Online block active - that must be enabled.

Sweet...........thanks

This great hack not showing the number of 24 hours visitors . it shows just Usernames. in its settings I did not found any setting for this.
can anyone help me please?

thanks

This modification only shows members. For showing visitor install this one. Track Guest Visit by Paul M.

In 3.5 version like this hack shows number of visitors in -> ()
ok thanks

for some reason, it shows all the people on the right, and when the forum is busy, that list takes up a full screen... how can I fix that?

http://forum.fatboymagazine.com

Does who's on have to be activated for this to work?

Yeah this isnt working for me

Because guests do not have their timezone set correctly (or rather they use the server's timezone). And thus it can show skewed numbers (if the guest is in a timezone that differs a lot from the server's timezone).
Since my server is in Canada, this often happens and incorrectly implies that my site has only a low amount of activity.

For now, I am using the rolling 24 hour option, but it does not have my preference :(

This is an awesome hack, and it was the easiest I've ever installed.