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: 4

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