Mack,
the program continues spooling or whatever in the background. Shouldn't it cancel spooling and processing too when I hit Cancel?
When you Cancel the print operation in QU, it only cancels the QU process, once it says "Finished Processing" below the process bar everything is in the hands of the driver and it is that what has to be cancelled.
If I click the Cancel Print button (top right of screen) while QU is still "processing", it stops almost immediately.
Perhaps I've not understood exactly what happened with your situation?
Terry