White Bar Obstructing View

Hi. I recently installed Elgg on a web host, and it works great. The only problem is that on every page that contains Elgg stuff, there is about a 5 in. white bar at the top of the screen that is obstructing my view, and my visitor's views, to see the whole page. Sometimes I have to go into the source from my browser to see what *should* be there, but isn't becuase of this white bar thing.

If you have any suggestions on how to fix this, it would be greatly appriciated.