#block-system-main with no content interrupting my layout I have a drupal page with three blocks beeing rendered and floated besides each other in a content area. In the middle of these, Drupal renders out a block called #block-system-main with an empty content div. It breaks my floats, and I have no idea where this div is coming from or how to remove it.

Any ideas as to what could cause this and how I can remove it?
I dont know where it comes from. Probably best would be if you can find that. But if you want to quick fix it. You could unset it in page preprocess 

function YOURTHEME_preprocess_page (&amp;$variables, $hook) {
  unset($variables['page']['some_region']['block_id']);