Created attachment 5169 gdb log Under FreeBSD, with xfdesktop-4.11.0 xfdesktop-settings coredumps. I compile it with: - GLib 2.34.3 And the latest Xfce libraries (plus libxfce4ui, xfce4-settings, and xfwm4 development releases). In attachment gdb log.
Good news is that it appears to be fixed with the changes in this commit: http://git.xfce.org/xfce/xfdesktop/commit/?id=af240b063cd0678dc1739ffa28e93f1ff530bead which is from https://bugzilla.xfce.org/show_bug.cgi?id=10380 If you want to verify it does fix the crash for you as well.
xfdesktop 4.11.1 works fine.