I am sometimes experiencing slightly odd results when my Nikon D600 runs into very saturated blue light that approaches over exposure. An area being hit by light may in fact end up becoming darker than areas not hit by this light. I believe it’s a result of RawTherapee’s way of dealing with color saturation (increasing saturation causes colors to always become darker in RawTherapee when using the “Saturation” slider, and maybe the same algorithm is used inside the color profile section?)
Here’s a piece of white paper on top of a blue LED. For each picture I raise the exposure level, and then odd things start to happen:
Now, disabling the color profile section makes things a bit more normal:
So try disabling the color profile if you have this problem. But watch out: Disabling the color profile may also result in odd colors, so this is not a perfect work-around.