When exporting Illustrator artowrk as a PDF it sometimes shows all the colors as black in Mac preview. I am concerned that when sending it to a printer that they may see it as black and print in black as well. I am currently using the latest Mac OS 10.7.4 and Adobe CS6. Our artwork is all in PMS colors when this issue happens.
Here is a couple screenshots of the issue in preview and the actual artwork when opened in adobe. Thanks.