Duolingo 'upgraded' but soon after degraded again.
Recently I hopped onto Duolingo and the site was looking a lot better. There were a lot more handy tips and descriptions for answers as well as store items. This version was much more helpful. On the store I bought something that was an extensive test, which I was going to get around to using. The next day, these features all disappeared and I lost the extensive test I purchased.
I think what's happened is that when you came back after a break, you've seen a new version of whichever course you're using. Then, a couple of days ago, you've been moved over to the new code, which is missing a couple of features, including the Progress Quiz.