UPDATE FROM MABULA
I have had a very rough 2 months unfortunately health wise. I was struck 3x in a row with bacterial infections. The second infection occurred  after a routine hospital checkup and I became very sick. I had to rest and take a lot of antibiotics. Once I was recovering and restarting work 1 month ago, I again became sick. The infection was not yet gone, so even more antibiotics and rest was needed. Needless to say, it took a lot of my energy and I needed a lot of rest.
Finally, the infection is really gone and my energy is coming back step-by-step now and I have started work again. I am terribly sorry to have kept you waiting for support. I will address all outstanding questions and e-mails step-by step and will be on the forum daily from today.
APP 2.0.0-beta47 will come soon as well, a lot of work was already completed before I became very ill, so the release is also nearly ready for you. Beta47 will be much faster actually. Many workflows will be more than 2x faster, mosaics can even be 10x faster than before because registration really received a major boost... all compared to beta46. Â Before I release it, I will make sure that everything is working properly and then I will release it.
It seems that the black point changes unexpectedly when clicking the Calculate button in 9) Tools in the RGB Combine tool.
If I add red, green and blue channels, then click Calculate the image is created as expected. If I then change the black point (to say, 0.00602) then click Calculate again, the black point is changed to a different value (in this case, 0.00562). This change is repeatable, although the new black value varies.
Likewise, if I lower the white point it is raised to 1.00 and Gamma is reset to 1.0 when Calculate is clicked.
Shouldn't these settings, once set, stay as I set them, despite repeated usage of the Calculate button?
So to be clear, you're talking about changing the background stretch value on the right side of the preview window right? Not the bg slider on the left per channel..
If so, that preview is set to update automatically, so it then recalculates the so called optimal background value and such. You can switch it off by clicking the "auto" button on the right.
I am talking about the black point, white point and gamma. But yes, I see that turning off auto does not reset these. Perfect.
Case closed and thank you!
