[KevinH]

As a test try the following:

1. open Terminal.app
2. Type the following commands and hit return after each

export QT_OPENGL=software
open /Applications/Sigil.app

Then see if you can recreate the crash. If that fixes the issue we can then try to figure out how to make it work when launching Sigil from the dock and not Terminal.app. Since I typically am using dev builds from master I always am using Terminal.app to launch Sigil.

If need be I can modify Sigil to look for an env variable text file and load it for the next official release.

Hopefully Apple will fix this soon.

FWIW, when Sigil crashes it can corrupt the sigil.ini file used to hold settings and that could cause crashes as well at start-up. To rule this out do the following in Terminal.app

cd
cd Library/Application*Support/
cd sigil-ebook
cd sigil
mv sigil.ini sigil.ini.backup
cd
export QT_OPENGL=software
open /Applications/Sigil.app