I do “ctrl-p” to open the Aperture print dialog. Than click the “print” button to open the printers print dialog. If i than decide not to print (rather to start over again, for example the wrong printer is selected) i get back to the Aperture print dialog on which all clicks end in a beep - Aperture is blocked. I need to force quit it!
My printer is a Epson R2400, Aperture is 3.2.4, OSX Mnt Lion 10.8.2