2019 November: Complete LRGB Tutorial of NGC292, The Small Magellanic Cloud by Christian Sasse, Astronomer in Charge of iTelescope.net
2019 September: Astro Pixel Processor and iTelescope.net celebrate a new Partnership!
How to Debayer
Hi, sadly I can't as the iMac is a 2010 one - I've reached the max potential. However El Capitan is an even earlier version and it works on that !!
Yes that could be some random change Apple made in a certain feature used by APP. That's a known issue with Apple sometimes. I hope @mabula-admin can have a look.