I'm running the following:
Lightroom 5.7
Mac OS X Yosemite 10.10.2 on iMac
Epson StylusPro 3800 printer
Previously, everything worked when I tried to print 12x18 prints on 13x19 paper. I had unchecked the Scale to fit paper size box on the print dialog and I was getting 12x18 prints every time. I don't print often, so it's been a while, with only updates to LIghtroom in between. Now, LR will not provide a 12 x 18 print. They all come out 12 x 17.375, or so. And nothing that I do will change that. I'm using the Super A3 setting, which is what I've always used.
I decided to try to print the photo from PS CS4 and it worked perfectly. I got a 12x18 print centered in a 13x19 sheet of paper. It used the same dialogs as LR, but performed correctly. Same printer. Same driver and ICC profile.
Am I missing something in LR?
Thanks in advance for your help!