Yes the sources look fine when directly connected. I have swapped and bought new cables. The lengths are between 6 and 8 feet each. I have tried adjusting the receiver video settings to no avail. I even set the receiver to video pass through and nothing eliminated the black crush issue.
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rangler

Marantz SR6006 in 7.1 configuration
Visio XVT553SV
Oppo Digital BDP-83 blu-ray
aperion 533-VAC, 532 L/R, 534-SS surround and rears, S10 sub-woofer
scientific atlanta 8300HD
harmony 900 remote