I have several image sets of varying quality that I have no problems doing StarAlignment. The same images are run through DrizzleIntegration and then fail. Alignment is off the L master, and fails for R, G, B, HA, O3, & S2.
I have another 4x panel of IC 1831 where it is just 2 panels (Panel 3 & 4) where only the S2 fails alignment but this fails in Mosiac working mode. I can however combine the 2x panel's S2 for originals, just not the drizzled. Thus a 4 panel mosiac can not get completed. For the S2 images the stars are not the best, brighter stars look good whereas really faint stars are streaking from the 9 minutes subs.
I have played around with settings some, but nothing works and now I am out of ideas and options and hope to get some advice or solution to move forward. The poor quality sets I am not too concerned about, my focus was very poor at time and I will eventually redo these. But the 4 panel mosaic failing on S2 image set is extremely frustrating as I am so close to stitching the final image. Panels 1 & 2 already processed, combined, aligned, etc.. just fine.