Using Sirilic issues (and background extraction on each light frame)

I am running Siril 0.99.8.1 and sirilic-V1.13.1. On windows 8.1 and windows 10 btw, not Mac.

Since sirilic did not give much succes I now try running scripts directly on Siril. I first ran the “build-in” script OSC_Preprocessing.ssf, after editing it (I do not have darks, so I threw out the darks preprocessing and substraction from the light). This runs fine, but also gives a strange final result with lighter spots all over the frame (It looks a bit like it added flats instead of substracting). This final result looks simular to the result that came out of sirilic btw.

I suspected something fishy in the script (I am not so experienced in scripting stuff) so I found and downloaded the OSC_Preprocessing_noDarks.ssf and ran that script. Now it converts (at least) one of my Canon RAW’s in the series into a FIT that is 1 pixel larger than the rest, which on its turn raises an error during stacking…

So somehow I run into error after error, so it seems…