Today I've had problems with three schedules. When taking quizzes, I constantly get the error "Sorry, the page that you were looking for could not be found. Please use the menu above to access the areas of the site."
Sometimes I can get into the quiz and answer a few questions before I get the error. Sometimes the error comes up immediately when I click the "study" button. On a few occasions, when answering a question correctly, the success box (for lack of a better word) did not update but continued to show the previous word. The quiz then crashed on the next question.