I got one a couple of weeks ago telling me there was a gap in my work history. I have checked, double checked and triple checked and I have all time accounted for all the way back to my high school and before. I don't know what else they want. I emailed them (of course not expecting a reply) and haven't heard anything. From reading on here and a few other places, once the problem is corrected, it seems like a 50/50 chance of getting the interview. Some people get letters within a week and some are several months in without a word. I'm kind of freaking out because I don't know what they think is wrong or a gap.