I have the same problem, however it's not xfce4-settings-manager that crashes for me, but the daemon xfsettingsd, and when it segfaults, xfce4-display-settings crashes.
And I managed to find that it segfaults as soon as you connect the THIRD monitor.
It's stable with one or two monitors, and crashes when he detects the third, whichever it is.
I have the same problem, however it's not xfce4-settings- manager that crashes for me, but the daemon xfsettingsd, and when it segfaults, xfce4-display- settings crashes.
And I managed to find that it segfaults as soon as you connect the THIRD monitor.
It's stable with one or two monitors, and crashes when he detects the third, whichever it is.
I can provide a log from coredumpctl /pastebin. com/raw/ 0h0S4biu
https:/
and a log obtained launching 'XFSETTINGSD_ DEBUG=1 xfsettingsd --replace --no-daemon' /pastebin. com/raw/ 4yJNvGhi
https:/