Photo Preview of PDF files doesn't work with Bluebeam installed

Running with PW SS4 .590 or PW CE .67, with Acrobat Reader 11 installed, PhotoPreview of PDF files works properly.

Once I installed Bluebeam 2015.6 - standard as a PDF editor (Acrobat Reader 11 remains on the machine), Bluebeam becomes the app for PhotoPreview and the PDF files do not preview properly.

How do I set the PhotoPreview back to Acrobat Reader?