OK...well I am glad I found this, as I 'almost' have the same issue. I purchased the Nexus 10 and love it. Everything works fine...i can view my photos with sound on my HDMI cord to my TV, etc and all works fine, with the exception of MOVIES. When i use the PLAY MOVIE via Play Store, the movies play fine on the tablet, but when i plug in the HDMI cord, the movie stops, like its trying to buffer and stays like that forever. I pull the HDMI cord out of the tablet, and i can press play and plays fine on the tablet. I have tried rebooting it after i plug in the cord, during, etc and nothing seems to work. Any suggestions? I have also used 3 different HDMI cords as well with no luck!