Hi all.
I´m having the same crash. FP app crashes, while Acrobat is still running.
After deleting "Avenir Next.tcc" and "Avenir Next Condensed.tcc" from "Macintosh HD/System/Library/Fonts", the problem goes away.
Not sure what else goes wrong when these system fonts are missing.
Acrobat X (10.1.8), Mavericks, FP 9.1.0.