WordPress version: 3.4.2
WordPress SEO version: 184.108.40.206
I did this: set the default image with a size of 600px by 330px. The size is also selected in the image details when selecting the featured image. the default size for 'small' in the WP media settings is 300x300.
I expected the plugin to do this: use that size (or the 'large') in the og:image tag.
Instead it did this: uses a 300x150 size image, which is not used anywhere in the post.