Printer automatically stops

Using version 1.2 on a Windows 7 machine
Printing from any document automatically brings up the PDF Creator monitor with the print queue set to stop. Click go and it works fine.

Send a nother document to the printer and it stops automatically.

I tried to use autosave, but it made no difference as the queue appears befoer the file save dialog box. Uninstalled and reinstalled but no joy.

Any ideas what this could be?

I've reset all the settings, checked the port settings against a machine that works. It should be something very simple, but I cant think what!