I've had this site up for many months now and just noticed this bug. When I click on a post title link to view the post as a single page, my layout breaks - background boxes lose their 100% height and in Firefox the comment area is totally inaccessible. I'm looking at this on Mac Firefox and Safari - am not able to check it on Windows at the moment. I can post screenshots if you're not seeing the wonkiness I'm describing.
Any suggestions on what to fix? Is it something in the single.php file? This is a free WordPress template that I've barely modified - just changed a few colors and the header image in the CSS file.
Link to guilty page (compare it with homepage to see background boxes behaving as they should)
http://woodfordgallery.com/2008/03/building-renovation-continues-2/#comments