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You might try making sure there is no text underneath the drop shadow or any vectors.(Indesign) If there is apply a 99% opacity to the graphic/text underneath the awesome drop shadow. That could fix the problem.
 
I feel your pain.

Its frustrating when it appears on the plate and not on the proof/screen.

My suggestions are to make make sure your outputing it as an Acrobat 5 (1.4 PDF) and to check if their CTP allows
live transperency (they should though?)???
 
Print as image

Enable "print as image" in the "advanced" tab in the Acrobat print dialog and it will rasterize the transparency to whatever ppi you specify. All will be good then. You can also open the PDF in Photoshop which will also rasterize the file which will then print fine (this use to be known as the "poor man's RIP").
 
Me too. . .

I ran into the same problem with drop shadows on a placed illustrator, but I've seen it on text before too. Printing to postscript and using the Acrobat 5 setting through distiller didn't help. BUT when I exported straight from InDesign with the Acrobat 5 setting is worked.

I have a client who with no imagination (like most). He can't see beyond the white lines when viewing the PDF I sent them. I know they won't print, I've told him they won't print, but he wants it as a PDF and wants the lines gone.

So sometimes you need them to not be there.
 
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