I found a solution, but not the cause of the problem.
Another poster on the PixInsight Forum posted a similar result with the ImageSolver script with the same error message. The discussion never got to the point of diagnosing the problem, but the or…
I can verify I’m using PI version 1.8.9-2 and ImageSolver 6.1. I plan to take this to the PI forum as advised, but I’ll add detail now and post the solution when I have one.
Since your post, Blockhead, I’ve tried a repair reinstall and a remove and…