Results 2 comments of Emil

The problem are the 256- and 16-color spaces, see issue [[TW-585] bold only respects "named" colors #620 ](https://github.com/GothenburgBitFactory/taskwarrior/issues/620) As stated in the man task-color when mixing 16- and 256-colors: >...

I can't 100% confirm that it was the same issue as you have, I didn't run the gdb backtrace, but Emacs also segfaulted and I don't have xwidget support, but...