I can't post on the Verge forums on any web browser on my laptop

For a little while now I've been unable to post anything on The Verge forums on my bog-standard 15" Windows laptop no matter whether I use IE, Firefox or Chrome. The issue is that the big black navigation block at the bottom of the page is over the top of the text box. Additionally, when I click 'reply' on a post, nothing happens.

Has as anyone got any idea what is going on?

Many thanks