Install qt 5.3.1 from this site.
Run the following 2 commands on a dual head config:
'xrandr --output (cur output with qmlscene) --off'
With qmlscene you get a SIGSEGV.
When running checkbox-gui on ubuntu utopic (5.3.0, but also tested with 5.3.1) you get a pure virtual method call in the following function:
"void QQuickScreenAttached::screenChanged(QScreen *screen)"
(See attachment for the full backtrace).