PDFCreator tasks not showing up in job queue

Hello,

I'm having the following issue: whenever I click on the "print" button in the usual print pop-up with PDCreator selected, nothing happens. The printer icon shows up in tray but no job is registered and no file is processed. (I am running Windows 7 SP1 and the last version stable version of PDFCreator). Any clue?

Thanks in advance,

N.