Your master dark has an mean value of 820, your Ha light frame has a mean of 420. There is definitely something different in the settings used to capture darks and lights, when calibration performs the subtractions most of the Ha signal gets rounded to zero.
I'm quite sure this would not work with the old version too, unless you had dark optimization enabled (which affects the scaling of the master dark).
I really think IF the same session works on version 1.5.3 the only explanation is that some settings in WBPP 2.0 are different form version 1.5.3.
If you still have a log file from a working integration with version 1.5.3 maybe I can compare...
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I have mislead you. I do not know if I can successfully process using the older version. But since I never had any problems prior I assumed I could continue using the older version.
I have a library of darks, flats, and flat darks. I redid the flats and flat darks this past week....but the darks have been used successfully for several months. Are you saying you feel my issue lies within the darks, flats, and flat darks. I am using cmos cameras - two different ASI1600MM-C pros and they each have their own libraries and they both are returning uncessfully results using WBBP 2. Whew! I am sorry to be so lost in figuring this out for myself (old retired football coach).