Flash cards don't appear in final review section

German Modules 16.1 and 16.2: the flashcards don't appear in this final level 2 review.
I just get the spinning wheel and if I click "get started", I get a blank flash card. If I click "flip" I get a blank reverse card.

I quickly checked module 24 the final level 3 review and it has the same problem.

Thank you for the feedback sfpugh, 

I have gone ahead and reported the issue to our tech support team; once I have a reply, I will let you know.  

Kind Regards!