Mac OS 10.10.5 (Yosemite)
After getting the crash discussed in this thread, I tried the suggested remedy:
Applications $ Bitcoin-Qt.app/Contents/MacOS/Bitcoin-QT -resetguisettings
...which brings up a "Welcome to Bitcoin Core" dialog box that says since this is the first time the program's been launched the entire blockchain will be downloaded. I guess I can do that, but do I have to?
Did I misapply the remedy by trying it only after running 0.15.0 without it and getting the crash, instead of on the first run?