Specifically the layout with right and left sidebars. My client discovered this bug. If you add a 4th post, the right sidebar is forced below and its content gets squeezed. Up to 3 posts and it's fine.
The errant closing "</div>" on line 70 of index.php has been eliminated so that's not the issue
Here is the site showing the problem on my test server. Scroll down to see the right sidbar: http://cagv.markhannondesign.com/new-wp/
Any way to fix this?