If a teacher is working in the grade book window for a while, their session may time out without warning.  When the teacher closes the grade book, any grades entered after the unknown timeout time are lost.  It would be helpful to present the Session Timeout login window within the grade book and/or display a warning message in the grade book when a teacher's session is about to timeout.  Either option would prevent loss of grading information.

The same would be helpful inside of School Form settings.  If you are making a lot of changes to a long Recipients list, you could time out without warning.  Upon clicking Save & Close, all changes are lost.