I have a similar problem.. Printing to letter size paper on an Epson 4800 from a Mac produces a good image. Go a larger paper, say 11x17 or 16x20 and I get only a small image in the lower corner, which is cropped at both sides. The image on this larger paper is about the same size as the 8.5x11 with the rest being blank. Print from Preview or Nikon's View NX2 and it comes out perfectly. I can't find an answer any where on the web or on the forums with a solution. Adobe has not been helpful. This seems to be a LR5 issue and NOT a Mac or Epson one. Any suggestions or ideas?