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When I import the demo content everything works except the video game articles.

This is because during one of the Flavor theme updates the mechanism for determining minisite ID’s was improved, and it affected the video games minisite but not the others. If you really want to import these articles you’ll need to create a fourth minisite with video_games as the slug (instead of videogames) and import the xml file again, and then use the convert post types plugin to convert them into your original video games minisite: http://wordpress.org/plugins/convert-post-types/