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.
Regitration mode is Quadrilaterals(1-5), flip X/Y descriptors = off, dynamic distortion correction = on, mode: Normal, projective.
Integration mode is Full.
I think it's something to do with distortion model threshold. Depending on the number I get different shapes.
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@maximastrophoto-com this happens me when I had dynamic distortion correction on. I never use that anymore and no problems
Disabling distortion correction fixed it.
@stefanastro Yes, disabling lens distortion correction helped make integrations rectangular again. There may be some small collimation issue that makes distortion correction go crazy even with 0.1 as threshold value. I can correct distortion later in PixInsight.
