PDF produced by Sibelius is displayed correctly, but prints badly, an unacceptable disparity
I am using MacOS Big Sur 11.6 and Acrobat Acrobat version 2021.007.20099.
The attached "Ful Score" PDF is displayed properly on the screen by Acrobat, but Acrobat prints it badly. I also included two screenshots, a *.png of Acrobat's display of the PDF (which looks OK) and a pdf produced by scanning a physical printout of that same PDF printed by Acrobat, which shows that Acrobat prints the file really badly.
The PDF was produced by Sibelius. I might say Sibelius was at fault for producing a bad PDF (probably with layers, but I'm not sure of the internals), except for one important fact:
The latest version of Acrobat displays it correctly and prints it badly. That disparity means you can't trust Acrobat to show you on the screen how it will print. That's really bad news. It means the software is lying to the user, who won't find out until after it is printed. Or even worse, until a customer on whose website you posted the file (because it looked fine in Acrobat) tries to print it and goes berserk -- lawsuits or other kinds of attacks are inevitable.
Gordon Sheard commented
I'm having the same problem.