Hi Steve,
Qimage Ultimate will not print pdf files. They were never considered to be in the category of quality images.
If you really want to print pdf from Qimage, you will need to convert or export to a jpg or a tiff

Fred

Is there any chance that printing PDFs will be supported in the future?

We are a photo lab but do a fair amount of commercial work as well. That work is almost 100% PDF.

I'm not sure if this reply is relevant, if not, feel free to delete it.

Print-to-PDF apps have been around for a while.  I remember BullZip from years ago.  (I just checked, it's still under development.)  Depending on needs, there are at least a few such for Windows, a couple freeware.  CutePDF rings a bell also.

I've used PDF-Xchange Editor Plus ($hareware) for the last 10 years as an alternative to Adobe.  It includes a PDF printer driver, installed as a Windows printer alongside my Canon PRO-100, Epson XP-4100, and the other "printers" (?) installed by Windows.

I don't use Print-to-PDF for anything other than occasionally being a convenient format for sharing.  So I'm not really concerned about color management, but on-screen (HP Notebook), the PDFs look "close enough".  Refinement of color management may be possible, I've just never looked into it.  

If I want to add an image to a PDF, I usually just drag-and-drop or copy-and-paste.  But for printing multiple images to a single page, QU might be the way to go.