I get many PDF files from customers that won’t print or produce unexpected results. So how do you investigate and fix these files? I use preflight in Acrobat Pro.

Many things can cause problems; unexpected colour shifts, missing fonts, low resolution images, Pantone colours not supported by your rip, b&w documents that generate colour click charges. All these problems can be discovered and many of them can be fixed using the preflight features in Acrobat Pro.

This is an excellent video from Adobe TV that provides an overview of preflighting in Acrobat Pro 9.