Skysafari 6 Pro on MacOS Mojave.
I found a problem that probably could easily solved. Choose a nebular image like Lagoon Nebula and zoom on it. Open Settings Menu -> Precession and try switch Aberration on and off. When it's on a displacement between actual stars and nebular image is clearly visible as if Aberration would not be applied to the image pointer. I tried with other images and found the same issue.