I've got the same problem with my 2012 26" refurbished BTO. I noticed it as soon as I finished setting up the machine for the first time, as the window from the setup prompts remained visible on the grey background of the login screen. My attempts for an easy solution through AppleCare turned out to be a futile attempt, as they ended up requiring me to bring the computer into an Apple store so they could "confirm" the issue. I'm wondering how the rest of you who have gotten them to agree to a replacement have done so without having to first bring it into a store? Also, as far as I know, they will first require it to be repaired, not replaced immediately, which to me, is unfortunate, seeing as this is my work machine and I'd prefer not to have its life begin with a repair done by some guy in an apple store, not to mention the down time, waiting for them to repair it.