Since 6.45.5 pop up login page for hotspot is not working anymore. 6.44.6 long term working.
Mikrotik please solve this bug.
Look at the posts below:
https://forum.mikrotik.com/viewtopic.php?f=2&t=154193&p=770642#p770642
http://forum.mikrotik.com/t/redirecting-after-connecting-to-the-wifi/133550/1
http://forum.mikrotik.com/t/fresh-config-on-6-45-3-hotspot-not-working/132683/7
http://forum.mikrotik.com/t/forwarding-to-login-page-of-hotspot/133479/15
http://forum.mikrotik.com/t/hotspot-no-longer-working-connection-refused/132096/1