White space under header?

Here is a screenshot:



Can anyone tell me why there is such a large white space underneath the title/header/nav bar of the forum? How can I cut down on that?

Yes, I've taken away that "search nav bar" - but I don't think that causes all of that white space...

Ahhhh...

Well, I tried viewing the page from Internet Explorer, and sure enough - some advertisements are now located there (it's just that they weren't showing in Firefox with adblock).

How come they never used to exist? This is new...yesterday, there were definitely no ads there.

Thanks, Sanket. Problem solved. Much appreciated.

Or you could change who ads appear for.