You might also try swapping the HDMI cables between the X-BOX and the BDP. You may have a bad cable in the mix. Assuming the cables both test good, one other test to rule out the Outlaw would be to swap inputs between the X-BOX and the BDP. That will rule out a bad input on the pre/pro.

All that said, I'm also inclined to believe it's something in your BDP setup somewhere. Are you able to tell us the model and/or how you have the output set?