AHA!
If you open up Acorn’s Settings… window click on the fussy tab, and change the Backing: option to IOSurface, and then close and reopen your images, do things begin to work?
AHA!
If you open up Acorn’s Settings… window click on the fussy tab, and change the Backing: option to IOSurface, and then close and reopen your images, do things begin to work?