I suspect that you are using the "linear" curve, in the "process" panel, under "curve". This curve affects the contrast, and the linear one is giving a flat contrast.
Use any other available "default" curve (Standard 1, Standard 2 or Standard 3) by clicking the pull-down menu (click the "arrow" in the upper right corner in the "curve" plugin)or create your own contrast curve by changing the shape of it. Once you have found a curve that fits your taste, you can save it with the pull-down menu (click the "arrow" in the upper right corner in the "curve" plugin).
I'm still learning my Sinarback 54M.
The back provides excellent resolution. Shadow details are brought out very well.
The Saturation is set to 100% in CaptureShop 5.6.1.
But the colors look washed out and had turned into a very unsaturated version of what I normally see by eyes.
How to improve the colors?