Grade Center - I get an error trying to create or update a weighted column using Safari

I get an error trying to create or update a weighted column using Safari.

Instructors using Safari may get an obscure error message when trying to update a weighted total in the grade center.  The error might be something like

blackboard.persist.PersistenceException: Unable to generate id. The
provided key value is invalid:
blackboard.platform.gradebook2.GradingPeriod - - {2}
For reference, the Error ID is 6de2907d-427a-4b68-bec2-578dd25369e5.

The bug occurs if there are no grading periods in the course.  You can fix the problem by creating an empty grading period.  Go to the Grade Center and click on "Manage"->"Grading Periods",
create grading period safari

then "Create Grading Period"; give it a name (perhaps "term") and click "Submit". 

create grading period 2

create grading period 3

Lastly, the most permanent fix is switching to Firefox.

tags: error message, weighted grades, grades, grading, safari, browsers, persist, Persistence Exception, grading periods, generate id, firefox, errors

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Instructor
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