How do you proof that black becomes transparent? Are any transparency effects used or what?
When I export to pdf I can see that images in the back are showing through black layers on top of them, but I have not used any transparencies at all. The InDesign file looks completely fine it is just when I export as pdf. I have the newest version of InDesign and CreativeCloud.
Black is set to overprint. That's what your are likely seeing in Acrobat. You can open the preview in ID or in Acrobat and turn off the simulation of overprint to check if then the.black layer obscures the image.
That fixed it. Thank you!!!