I seem to be experiencing "black crush" when passing HDMI video through my receiver. This happens with both my SA high def DVR and oppo bdp-83 blu-ray player. My TV is a vizio XVT553 which has excellent shadow detail performance but this is lost when hdmi signals come from the receiver. I have not been able to calibrate this out with the contrast/brightness/backlight settings. To avoid this problem I have been connecting all sources directly to the tv. I would prefer to take advantage of hdmi switching if possible. Has anyone else run into this problem? How did you take care of it? Thank you in advance for any and all help.