It's Firefox on Ubuntu 12.04 on an Asus Eee 1005P. I think it's just a vertical resolution problem - comparing on another screen it looked like the big red button was just cut off, and without the scroll bar working there was nothing I could do on the front page.

Checking again, I see that there's a four or five pixel strip of red bottom center that is actually clickable, but it's not exactly obvious. Screenshot here: http://imgur.com/JWcaP