When printing A3+ only in Lightroom it prints in the top left corner only using a third of the page and cropping off the top. I have tried in photoshop and other packages and they work fine. A3 works fine too, only when I use A3+. I'm using a canon Pro 9000 printer.
I am running MAC so not really an option. It use to work fine but not used since the last LR update. I have now managed to find a way around it by creating a custom paper size. Must be a problem the way LR reads the data from the printer driver, too many digits or something.