I also could not reproduce the problem with the worksheet you gave me. I have reproduced it with the following worksheet https://cloud.sagemath.com/projects/80f4c9e7-8a37-4f59-82e7-aa179ec0b652/files/public/new-order.sagews which leads me to believe that it is caused by a 'corrupted' worksheet. My guess is that the corruption occurs either when I change the contents of a cell while a calculation is running in that cell or another cell, or I change the contents of a cell after an unsuccessful attempt to stop a calculation, possibly followed by a restart. I have done this many times over the course of creating my larger worksheets, but have not yet nailed down the problem.
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