setstylesheet on a QComboBox causes a segmentation fault

when setting a valid Stylesheet to a QComboBox the application quits with a segmentation fault:

QComboBox

{ border: 1px solid gray; border-radius: 3px; padding: 1px 18px 1px 3px; min-width: 6em; color: #eeeeee; font: 27pt "Arial"; }

QLineEdit, QListView

{ color: #eeeeee ;selection-color: white; }

QComboBox::drop-down

{ subcontrol-origin: padding; width: 15px; border-left-width: 1px; border-left-color: darkgray; border-left-style: solid; border-top-right-radius: 3px; border-bottom-right-radius: 3px; }

same stylesheet works fine on 4.7.0 and 4.6.2