Thanks Peter. I think I may have discovered the issue. I hadn’t appreciated it was possible to use roller ball on my mouse to zoom right into the comet to get a better placement of the purple ring, and also I hadn’t been pressing the save icon on the right, under the comet icon. I’m still not sure if I am meant to press the save icon on EVERY sub, or just at the end of marking the comet on all the subs. Anyway, the first stack I’ve done since implementing these changes seems to be OK, now I’m trying to keep the stars and comet static so it taking my poor laptop even longer!
I will report back with results.
Thanks for replying.
James