Can't use Rviz plugin ObjectSegmentation object_segmentation_gui (interactive object segmentation)

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ROS Fuerte
PR2 Gazebo

I'm testing PR2 Interactive Object Detection. When I add try to add a plugin to Rviz,
the ObjectSegmentation plugin from object_segmentation_gui,
Rviz segfaults and dies (see backtrace below).

The segfault is almost identical if using stereo camera or Kinect, so you can ignore the line "withDisparityChecked".

Also, when I tick the box to enable "interactive" (object segmentation) mode, the pop-up doesn't load, because it's not working I guess...

Funny thing, this pop-up worked the first time I tested PR2 Interactive Object Detection... now I realize it's broken.

Does anyone have some suggestions please?

cheers,
David.

Segfault:

Backtrace: