Yes! I opened that in GIMP and when I try to fill it, nothing happens. Invert selection doesn’t change it either.
Terry, I watched that video a couple of times before I posted - unfortunately it didn’t help.
Rich, I tried that video as well. Maybe this is some kind of fill issue. Hopefully someone can tell from the screenshot?
Thank you all for replying - I had to take a few days before I came back to this!
David