MAC authentication not working

I followed steps in :
http://wiki.mikrotik.com/wiki/User_Manager/QA/How_to_make_MAC_authentication
but still, the PC which MAC address I added pops up with login page instead of going straight to Internet?

Am I missing something here?

Ekkas

It seems it needed some time to ‘propagate’ or something, after a while, when I tried again, it worked without me changing anyhing.