Occasionally fonts used in nested graphics do not download correctly. Line Weight Line weights should be defined as .25 pt. or larger. Clipping Paths Beware of clipping paths. These paths are very memory intensive. Images clipped with complex clipping may not print on the imagesetter even if they print on your laser printer.
Complex paths are paths that contain many points.
Keep the path simple. Use the flatness feature if it is provided in your program. There's no more important step in producing your documents than proofreading. If your error happens to be a real word, the spell checker won't help. All color files in Photoshop must be saved in CMYK format.