Addendum to my earlier reply: I tried "verbose" mode on solve-field and get: Reading input file 1 of 1: "/Users/rnlucas/Documents/ekos/NGC6883/Light/NGC6883_Light_054.fits"... Base: "/Users/rnlucas/Documents/ekos/NGC6883/Light/NGC6883_Light_054", basefile "NGC6883_Light_054.fits", basedir "/Users/rnlucas/Documents/ekos/NGC6883/Light", suffix "fits" Checking if file "/Users/rnlucas/Documents/ekos/NGC6883/Light/NGC6883_Light_054.fits" ext 0 is xylist or image: Illegal instruction: 4Read More...