Where did all the "Know It", "Write It", ... sections go?

I am in the Spanish Travelogue (8.3 A New Itinerary - Part 1) and all of the testing sections at the end of the lesson are no longer displayed! 

[I just looked at a few of the other lessons - it looks like the others are OK.]

The problem is still there today for lesson 8.3. Moreover in the "Play It!" section, the audio hangs in the last conversation when playing the part of María (when Miguel is talking).