New Quizzes Blocked

[Theresa56]

We are using Canvas for a few thousand students for assessment purposes at our language center.  Since yesterday, New Quizzes isn't working for us at all.  We can't publish and use the quizzes we've made already in some of our courses (not all, strangely) and we can't make any new quizzes.

See link here for a few pictures of the error messages.

https://docs.google.com/document/d/1a3COQ0SXEPpRRzX0UfGIAMWMoNxiS_zw9DPE1d_zTIw/edit?usp=sharing

I've sent a ticket to Canvas but still waiting.  In the meantime, it is creating a huge problem because we have to field a few thousand students' troubleshooting questions, when we don't have an answer either.  Any ideas?