I am building a 500 page catalog for a company. Everything has exported as a PDF and printed fine until now. When I print everything looks just as it should. When I export to pdf, all my photographs and text are there, but any solid boxes I have drawn to be behind product in with the rectangle tool are missing. (Borders of catalog visible and those are built with rectangle tool) There is nothing covering the solid boxes when flattened during export, and all other sections have been built the same way with no issues... what could be happening?