xfce crashes with xrandr command

[arcasys]

What I did:

- Log into my account (posper
.xprofile contains a line
xinput set-prop 8 "Evdev Axis Calibration" 0 4100 0 6500 to fix the calibration
This part works. The line is necessary to fix the calibration issue because the touch controller assumes the combined display areas instead of just thd touch monitors area.
- Most of the time after that , the DisplayLink Monitor (DVI-1-0) remains black. This time it showed the xfce background and starting an application using this display worked.
- Run the command
xrandr --output DVI-1-0 --auto --right-of DP2
to provoke a crash.
- xfce crashes. Debug data should have been forwarded to Ubuntu.

A zip created with the DisplayLink debug Tool is attached.

As said, most of the time the display remains black in the first place. It will only show if a program using the second display has already sent some output to this monitor and the display position is changed using xrandr: surprisingly,
trying to set the position to 'below-of', which is the configured default, does nothing,
setting the postition to 'same-as' might or might not set it to 'below-of',
setting the position to 'right-of' and subsequently to 'below-of' mostly works nut sometimes this has to be repeated several times.

In any case, this is not an acceptable workaround for an end user and I'd be very glad if this issue could be resolved.