Firstly a huge thank you to the developers & contributors of Siril, it has been a godsend for me & I use it exclusively for all my preprocessing & initial post processing. In particular the photometric colour calibration has been a game changer for me. The trouble is I can no longer get plate solveing / photometric colour calibration to work. I am am using v126.96.36.199 & until recently it was successful almost 100% of the time but now it won’t even calibrate images it has previously been successful with. I’m baffled, surely I’m doing something wrong. In desperation I uninstalled/ reinstalled Siril & it plate solved immediately as it has done in the past on a particular image. But next image…no luck & following multiple attempts, all failed with: “the image could not be aligned with the reference stars”. I’ve researched as much as I can on the problem & I’m aware other users have had similar issues but surely it must be user error on my part if it is failing 100% of the time. Any help would be gratefuly accepted & thanks in advance. I’ll upload an image of NGC3372 which was successfully plate solved by Astrometry.net & previously by Siril as a test case.