This is Qt bug with MacOS Accessibility software and tools. If you can disable Mac Accessibility features and tools, Sigil/Qt will not crash. If not, and if you have an arm64 based mac (M1, M2, etc) try the special test build we made that has a number of Qt Accessibility bug fixes in it.
These fixes will appear in the next Release of Sigil.
See
https://github.com/kevinhendricks/Bu...OnMac/releases
And grab and unpack
Sigil.app-testbuild2-Mac-arm64.tar.xz
The crashes should now be gone as this version.
If you have an intel x86_64 mac, I just created:
Sigil.app-testbuild3-Mac_x86_64.tar.xz
that should fix your problems until the next release comes out.
You can grab it from the same place as the testbuild2 arm64 build on my github site.
If these builds for any reason still crash, please let me know asap, as we want to get all crashes fixed before the next release.