I have yet to take the DAT so obviously this hasn't not happened to me, but I just want to say that sucks!!! Sorry that happened to you. I'd be pissed if that happened to me especially if applications were waiting on it. Well at least you know what to expect in terms of questions for the next run at it.
The testing center shut down for aqz last year, and he had to take his test a week later. You can find his experience in the "ultimate breakdown thread" link in my signature. I'm so sorry this happened to you!!