the output from the printer is (in this case) a 13 x 19 grey square with red letters, printed backward (as in a mirror) "Out of memory".
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I haven't yet upgraded from 1.4 to 2, but I have this problem and I believe memory mismanagment in LR is at fault. I get the gray box problem in printing contact sheets (I mostly use PS when printing larger), and it started when I upgraded to a 1DsIII. I still shoot with a 1DsII as well, and when printing contact sheets with images from both cameras the MarkIII images are printed as gray boxes.
I'm using an Epson 2200 as the printer and XP on a machine with "4" GB ram and never previously had the problem before trying to print the larger Mark III images. I have, however, always had the problem of needing to close and restart the program basically every time I switch to a different folder because the on-screen image goes gray with the red "out of memory" (not immediately but after doing a certain amount of editing in the 2nd folder).
In troubleshooting the printing problem, I even tried plugging my 2200 into my MacBook Pro running LR through XP/Bootcamp and had the same problem. My work around for the printing problem is to export the images as jpgs and re-import them, and then print. It works.