Why are my changes not displaying when I update pages and posts?

I am trying to update pages and posts on my site. When I update, WP says Post/Page updated, but when I log out and view said post/page the changes are not applied.

This is only a recent bug and I am not sure what the problem is. When logged in, when I view the post/page the changes display fine.

I have updated to latest version of Twenty 12 and WP.