[ddouglass]

Skybird,
I think this is probably the best explanation. Mindonstrike posted this for another user in a similar thread.

Play a KMA file (using a video won't work for this part) and move your mouse to the TV and double click to bring the screen back to your computer.
Once it is playing on your computer grab the corners and stretch it to as full of a screen as you can get. Now grab it with your mouse and slide it back to the TV. Make any last minute stretching once it is there. Now double click the screen again, which will make your resized screen full screen.

Now when you play KMA's it will be full screen and when you play video's they will be on the resized screen.

We understand that your KMAs play fine, but in order to get the videos to play correctly you have to use the KMA screen to set the screen correctly for the videos.