With LyX 2.1.4 and OS X 10.10.5, I often get crashes when quitting using command+q. Oddly, the release notes for 2.1.4 say that it fixes another crashes on quitting bug (#8637). I was getting these crashes with previous versions of LyX when I was on Mavericks, but upgrading to Yosemite solved the problem until I updated to 2.1.4, which reintroduced the behavior.
Is anyone else seeing this?
