On my PC, my students and I can no longer access the chemistry quizzes and tests.  I can access algebra and geometry quizzes and test w/out issue.  The chemistry quiz scores and for my students also disappeared.  My students now have the notice, under their assignments, that "This assignment is not available in your language" where the chemistry quiz assignment was previously listed and completed.

Chemistry Quiz 1: https://www.khanacademy.org/science/chemistry/atomic-structure-and-properties/quiz/atomic-structure-and-properties-quiz-1?modal=1

Chemistry Unit Test: https://www.khanacademy.org/science/chemistry/atomic-structure-and-properties/test/atomic-structure-and-properties-unit-test?modal=1

It looks like some sort of JS error/bug probably from this line in the web page:

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