This is kind of weird and I feel like it is probably some subtle css rule that I can’t figure out. If you look on the linked page at where the blog posts are, the thumbnails for each post are inside an a tag and then inside a div yet when you hover them no link is registering to be able to click the image.
http://www.brainbuzzmedia.com/themes/simplybusiness/?page_id=72
I figured it out. The floated div was outside the non floated div.