Inserted images are not displayed

When I insert a reference image (or drag-and-drop a .jpg file) to either model or paper space, the image is displayed as a coloured rectangle.  The actual image is not displayed.

However, when printing (or print-previewing) the drawing the image appears correctly.

Scaling the image does not make any difference.

How do I configure Draftsight to correctly display an image file?

Thanks

Edward