Successify on "[Plugin: WordPress SEO by Yoast] SEO changes not saving for PDF's in the media library"

Have the same problem for all media files.

WordPress version: 3.5
WordPress SEO version: 1.3.4.4

I did this: Added seo title and description for a picture in the media library.

I expected the plugin to do this: To save the title and description.

Instead it did this: After updating the information is gone.