Question about MMS opening images

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http://androidforums.com – This just started happening recently. When I tap an MMS image to open it in full-screen, it used to open with the Gallery viewer. Now it opens as if it's a video, with a play/pause, prev, and next button. I've tried resetting the file defaults, but I don't actually know what program is opening the images, so it hasn't accomplished anything. Anyone have any idea what's been changed? (If this is the wrong category, just tell me) (General)