I’ve got to say, I’ve pretty much given up on Astropad.
For a while during beta, it appeared to be working fairly consistently, but lately, it works about 25% of the time,
even after rebooting.
Things like making a simple square using adobe illustrator do not appear to work.
I have downloaded Air Display and it and I have not had a functionality issue at all.
In answer to your questions:
- OSX10.11 (not Sierra)