On further investigation with other RAW ORF images it is clear that the shape or position of the graph on the histogram is not correct. With all of the images I checked, the histogram was bunched up on the left hand side indicating that the blacks should be clipped. However, if the "Show Clipped Shadows" is activated, the shadows are not clipped, there are no "blue" pixels appearing on the image. The histogram barely moves out of the blacks clipped region of the graph even if I move the Blackpoint slider to the extreme left.
It seems that the graph is not correctly calibrated.
This issue was apparent to me from the first windows beta version I downloaded. It makes the RAW module virtually unusable for me.