The D3D dialog is a Python script found in

Scripts/Partners/Dimension 3D/Render Firefly
That has been there since Poser 8 and gives access to more render settings than the standard dialog does.

Since you didn't know about it, then we can assume you never used it.
If you never used it, then you were always rendering with IC on in the past.

That makes sense. There's no point in my testing. Thanks for taking the time to save me the time.

Download my free stuff here: http://www.renderosity.com/homepage.php?page=2&userid=323368