Epson Stylus Photo R2880 feeds paper straight through without printing

So I recently got an Epson R2880 at work, and it at first it was awesome. After a few days, it started feeding paper straight through without printing (it doesn't even pretend to print) and telling me that the "Media [is] out or not loaded correctly". I went back and forth with Epson on it for a bit, and they ended up sending me a new printer.

The new printer seemed to work fine for a day or so, and then it started doing the same thing. If I turn it off and remove it from my printers list and then turn it back on and try again, sometimes it will make a print before starting to feed straight through again.

Here in the office, most of my printing consists of PDFs that I do through Acrobat XI. Some of them are borderless, some of them aren't. I have also tried printing from Preview and straight from InDesign CC and received the same results. I have tried multiple USB cables and my permissions are all in order.

I am running Mavericks 10.9.2 on a 2013 Mac Pro.

Since it seems fairly unlikely that I received two consecutive printers that have the same problem, I'm thinking that the problem is with something on my end. I'm willing to entertain the possibility that my luck really is bad enough to have two printers feed paper instead of print on it. I'm also willing to entertain the possibility that I'm an idiot and am repeatedly doing something idiotically. Regardless, I'm hoping that someone out there has some experience with this and can point me in the right direction, because holy cow this is annoying and Epson hasn't been super helpful.

Thank you for reading this.