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Sorry, I'm re-asking this question as there are not yet any responses....Notebook was working just fine. Then suddenly, it stopped working and nothing I try helps. You can type or copy and paste into the cell, but it remains as a box only one line high. Cell doesn't have heavy blue line around it; there is no "evaluate" button and shift-return doesn't run it. I tried killing Sagemath from the terminal by killing the PID, and restarting from the terminal; I tried clearing the Firefox cache; repairing disk permissions; restarting mac. Nothing works !!! HELP please !!!