I have had bad problems with astronomical image calibration with QHY9 images.
Background values gets below zero, no matter what offset I use, thats solvable by adding some
pedestal, but there was not this kind of problem before with older drivers.
The main problem is, that Flat frames doesn't work correctly!
I have used QHY9 a longish time and before I installed the new driver there was no problems.
I have uploaded some files to test.
Please, try to calibrate with those files and see if you'll abel to get them work.
I really want to figure out the reason for this behavior.
All the files are single shots, the idea is just to see if it's possible to get them work right.
Exposure time is 1200s, trough the 7nm H-alpha filter with LX200GPS 12" @ f4.65