Out of the blue, the preview mode in Acrobat 9 is showing PMS spot colors as black, CMYK colors show up fine. The actual pdf itself is fine. This happens when I make pdfs "High Quality" or "Press Quality" from Indesign 6. Curiously, it does not happen when I make a "Smallest File". However when I attach these pdfs to email, the spot colors appear black.
I've been using 9 for a long time and I've been using Indesign 6 for a few months now. I'm on a Mac Pro, OSX 10.6.8. I can't figure out if there is something that was unchecked or checked that is causing this problem to come up seemingly out of nowhere.
Any advice is much appreciated,
Thanks!