Hi Jakub,
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1. It is really the isue with the query looking from the comet center instead of the center of the image.
If you have in the settings the option calculated comet pos. ON then the queries seem to be done from that point out insted of the CRVAL1 and CRVAL2 from the header of the image.
I solved that by commenting out two lines of the code.
I have also solved the online catalog issue. That was related to my chang of the WorldtoPix function that was making issues with my mathplotlib and KOPR would not load the images. But now that modification caused the parsing of the star catalog to stop working.
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2. Could actually be the difference between the APASS v9 (vizier query) and APASS v10 (local copy).
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Thank you for your support
Best regards
Jure