Your last quiz has timed out. You will need to start a new quiz. However, all questions that you finished have been recorded.
I've been getting this more and more recently. This is the second or third time this week. Nothing to do with the day rolling over. That is set to 3am I think. I got this just now on a kanji quiz that I started an hour or two ago. I was starting the quiz for the first time after learning the terms.
Hmm - I cannot think of anything that I've changed that would do this, and I have not yet received reports from anyone else (except for one that was on the "day" line), but I will definitely be keeping an eye out on this.
I am not entirely sure about the best way to try and track this down, but I will be thinking on it, and hopefully a good debugging path will pop up for me. It could be server-side, or it could be something inside of your browser causing the session with the site (even if you are using the app) to restart too quickly.
