Ooh. Ok. Thank you! I'm using InDesign CS5.5, Acrobat 10.1.6. Mac OSX (10.6.8).
Layer 1: background (TIFF): does not show up
Layer 2: Type and logos (EPS): do show up in my pdf.
-When I select Overprint Preview in Indesign the background is missing.
-I have created pdfs in different presets (smallest, high quality, etc) and still background does not show up.
-When I place ONLY the background on a new InDesign document, it does show up in the PDF.
-I have created a pdf with the background in Illustrator and it does show in my PDF.