I've been using PDFCreator with success for a while.
At one point, it started turning into Hit or Miss when I would try to print something to PDFCreator. I'd select the PDFCreator printer, click "OK", see the printer icon show up in the task bar with "0 document(s) pending" and that was it! No prompt for a file name to save to.
With the latest release (1.2.1), it never prints anymore.
I have even gone into the Devices and Printers page and told it to "Print Test Page". Win7 reports that the test page was sent to my printer, but again all I see is the printer icon show up in the task bar with "0 document(s) pending" and that was it!
I'm guessing there must be a setting somewhere that is giving PDFCreator a default file name and the "view after creating file" is not enabled. ...otherwise, I'd be seeing errors, right?