OK my post got deleted, let's try this again using the strict standard.
WordPress version: 3.4.1
WordPress SEO version: 188.8.131.52
I did this: Used Yoast SEO to edit the title of a post
I expected the plugin to do this: Edit the title of a post
Instead it did this: Did not edit the title of a post. It changes the meta property='og:title' but not the <title>