Thanks for all the comments. A couple notes: 1. I've worked around this, and simply substituted another font (for now, at least). 2. Stone Sans worked just fine before I installed MacTex 2013; it also works in TextEdit, for instance, and shows up in Font Book (and validated without issue).
Writing the software to handle all of these variant formats must be a massive headache. Thanks to those who make these things work in the first place! Wm -------------------------------------------------- Subscriptions, Archive, and List information, etc.: http://tug.org/mailman/listinfo/xetex
