Strange. I have two computers that are running Update Pack 4, and I'm having printing issues with both of them. The first is connected a Dell 1710n (networked) and I get the IPP error, but other than that it seems to work well enough. The other computer, a fresh install of 201109 updated to UP 4, is giving me all sorts of printing issues. I have three printers I want to connect it to--a Dell 3100cn & an Okidata MPS420b (networked) and a Brother HL-1440 via usb. They all produced the IPP error. The Brother would print, but everything I printed was scaled enormously. Example--when I printed a test page, I appear to only be getting about a quarter of the test page, scaled too big. It prints Tux and about half the circular color test pattern next to him, and the only text visible is the word "Printer" and it crops off the rest. The 3100cn kept telling me to load size a4 paper, despite everything being set to Letter, including /etc/papersize (been bitten by that one before). The Okidata wouldn't print at all, though it's entirely possible I was not printing to the printer I thought it was printing to and the print jobs were coming out perfectly elsewhere in the building, come to think of it!
Oh, and I kept getting the error "pdf file is damaged - attempting to reconstruct xref table".
Okay, I'm done ranting. I'm sure I'll figure out these problems eventually, but it just adds evidence to my conviction that printers are evil.