Gamma/Knee problems: How do I correct this?

I drew a black-white ramp in Photoshop, exported it as a .png and a .tif. Imported into FCP (gamma: Source), placed in Canvas. Software and hardware scopes show the same thing. Changed gamma from Source to 1.8, 2.2, and 2.22. No fixes. 1.8 is the proper selection, except for the high knee roll off and slight S-curve. I've never bothered to test this before until today. Any solutions?
RGB Gamma Import: Source
FCP 6.0.6
OS 10.5.8
QT 7.6.2
Mac Pro 3,1
Tim

Also, if I make a .png from Photoshop, it displays incorrectly. If I export a .png (through QT Conversion) from FCP, modify it a little in PS, then re-import it into FCP, it displays properly.
Tim

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