well I've solved it! But it seems to not follow the instructions on the home page.
The settings of the XPS printer say to watch the "XPS print to onenote drop folder" - but anything printed there gets stuck.
If, however, I save an XPS (but not an OXPS) DIRECT to the Personal Notebook folder I get the dialogue box that lets me choose where in one note to save my printout!
Strange but nice! Thanks for your help.