Hi,
I'm a little confused - not unusual ;). If the login box does not display, does that mean you are unable to login? ... if so, how is the 'my account' link visible? If you have used the top (log in or join now) link to login, its maybe more confusing as to why it should be asking for a password when you are already logged in..
Can you provide a link to the page rather than just a pic?

To the issue of the login not showing on the homepage:
Does the homepage builder (admin panel) still show see more 'login' as included?
If it is still there and for some reason it is not being called i would imagine its not the php file, but potential a change in the css. Have you altered any of the css files recently? Might explain that or/join/label if its an open parameter.

All the best