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Why are you using X/1-a? It’s an outdated, archaic format. Modern workflows use X/4.
If you’re dealing with a Luddite printer, you’ll need to design accordingly. I never use transparency when creating ads for X/1-a magazines.
All that out of the way, I suspect if you turn on overprint preview in Acrobat the white will go away. I’m guessing that’s a spot color you’ve got the shadow on.
Are you viewing in AcrobatPro? Can you share the InDesign file package?
That's always been what the printers required. I'm checking with them now to see if this is just an assumption I've made from working with printers over the years, or if they really do require it.
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There are always risks with using transparency even when it's kept live.
See #19. I haven't checked if this has been fixed in CC2017