Superimposed Transparent PNGs

PDFCreator 1.2.2 downloaded today.  Vista Business.  IE7. 

HTML page with transparent PNG images overlayed by drag-drop.  Transparency maintained on monitor and when printing to paper (ink-jet printer).  PDF Creator shows backgrounds in PDF file.

I noticed that you now support transparent PNGs, so I guess I'm doing something wrong.  Would you help, please?