Version 1.3.19 (483) OS X 10.8.3
I’ve sent several Crash Reports today; further efforts have found a resolution, I think.
I tried Decomposing everything, removing all Overlaps, etc. but none of this helped.
Finally, I opened the .glyphs file in TextMate, commented out all the imagePath entries and resaved.
After that, no more crashes when attempting to Export as a .ufo.
That’s good info, but contrary to previous builds where there was no problem having all the linked images.