A strange problem here - upgraded to 12.04 and since then if I print a PDF it prints all the text content perfectly, but leaves a blank where an image ought to be! The print preview sometimes shows the image and sometimes it doesn't. Any ideas?
My printer is a Canon i9950, so I print through Turboprint. There were no problems with earlier versions of Ubuntu, but with 12.04 there is. According to Turboprint, the problem is caused by an incompatibility between Evince (the PDF viewer) and Ghostscript as used by Turboprint. So I'll try a different PDF reader.
I've also just noticed that the images that don't print were originally PNGs - jpegs are fine.