WordPress version: 3.4.2
WordPress SEO version: 18.104.22.168
I did this:
1. Updated to the latest version of WP SEO.
2. Under Twitter Settings, I checked the 'Add Twitter card meta data' box.
3. Cleared the Cache.
I expected the plugin to do this:
Add Twitter card meta data to your site's <head> section.
Instead it did this:
Nothing added to <head> section.