I made a 20 question multiple choice Quiz for a mathematics assessment.  This morning it was working perfectly and then suddenly the equations were not loading properly.  When editing you can no longer see the 'basic view' but rather the code behind the equation.  When previewing or testing in student mode, the questions start with the older version of the equation and then within 5 seconds it updates to a cleaner font but there are Math Processing Errors where the equation is no longer visible.  Furthermore it does not complete its loading of the questions and the last one is left incomplete.  This is a big problem as the end of year assessment is scheduled next week and there is not guarantee that the students will see a complete version of the quiz.  Has there been a recent update of the equations editor which makes it incompatible with previous work?