Hans, I have not done tests on Mac OS X and Linux. I don't know if there can be a difference with Windows.

new Q0 = old Q1 : 3D View
new Q1 = old Q2 : default rendering
new Q2 : rendering without diffused bounces
new Q3 : rendering with diffused bounces

For more details, you can consult PhotoRenderer.properties file I edited in the source code.

Thanks for your feedback.
If you get the same result, can you put images to illustrate it?