The header to login and does not appear on the Mac.

See here:
http://s7.postimg.org/z1nx4wrsr/header_not_showing.png

Can you please have a look?
Thanks.

What is the resolution on your screen? Is The browser maximised? If it is not, the game navbar will collapse below 1366px, and you will then have to use it by clicking on that button on the top right (on the navbar)

Hi.

Yes, it is maximized. It happens on a Macbook Air. I use the toolbar on the left side, which probably means the available resolution is a bit less than that one you mentioned.
Is it possible to decrease a bit the breakpoint from the current 1366 to something like 1200px?

Thanks.

Here is the size:
http://postimg.org/image/qovd45xhx/

The site is full screen, by sidebar is hidden. The width of the body as shown in the picture is 1305px.

Bummer, just below the threshold. I will see what can be done, but the danger is changing this and breaking stuff for other devices… Thanks for the screenshot BTW, it really helps.