When I run zenity --list --title=111 --column=222 --column=333 ab cd ef gh and select any line with a mouse (or keyboard) and then click on "Ok", I got:
$ zenity --list --title=111 --column=222 --column=333 ab cd ef gh
ef
Segmentation fault (core dumped)
When I select any line with a mouse (or keyboard) and then hit return on my keyboard or double click on said line, I got:
$ zenity --list --title=111 --column=222 --column=333 ab cd ef gh
ef
Is there something wrong with my computer, or does it happen on yours two? It used to work in 11.10. If it is not something my-computer-specific, I will report a bug, but this seems strange, I could not Google anyone with similar results and I believe zenity is widely used.
