rainborick - 2:04 am on Feb 3, 2012 (gmt 0)
It looks like a PHP crash to me. If you click submit as you suggested and check the source of the result page, you'll see that the output stops before the page has been sent to completion. So it's not a CSS issue. The sidebar and footer content simply aren't being sent to the user.
If you can't check your error log, error_reporting(E_ALL); at the start of your script may help you locate the issue. Good luck!