Displaying all posts on homepage

I recently updated to wordpress 3.9.1 and something happened where rather then loading all thumbnails of posts on the homepage, I now see an “older”/”newer” links navigation on the bottom.

How can I revert back to loading all posts on the homepage? I tried to deactivate all plugins, so there is nothing interfering there. I also found the reference for the older/newer links on the front.php page. Is there a command I can type in there that would force display all posts?

Any help would be appreciated! Thanks!
website