My PDF files open on Mac Preview covered with black

[#1]

The PDF files I make look great on Acrobat, but when I open them on Mac Preview, they open with black/dark gray background on all areas of copy (but not over the images). Please assist! Thanks!

[#2]

The PDF files I make look great on Acrobat, but when I open them on Mac Preview, they open with black/dark gray background on all areas of copy (but not over the images). Please assist! Thanks!

[#3]

You should ask in an Apple forum...