My husband and I both have GN2s. Mine is white and his is titanium gray. My sister emailed to me a video she took using her Galaxy S2 phone. I download it but I can't play it. When I try to with the stock video player and the MX Player app, it says "Cannot play video." I forward the email to my husband, he downloads it, and it plays perfectly on his GN2. Any ideas why my phone can't play it? My phone is stock TW with no root.