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cell doesn't have heavy black line around it; no "evaluate" button. Tried killing PID, restarting; clearing Firefox cache; repairing disk permissions; restarting mac.

cell Cell doesn't have heavy black blue line around it; no "evaluate" button. Tried killing PID, restarting; clearing Firefox cache; repairing disk permissions; restarting mac.mac. HELP please !!!

Notebook was working 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. Tried button and shift-return doesn't run it. I tried killing Sagemath from the terminal by killing the PID, restarting; and restarting from the terminal; I tried clearing the Firefox cache; repairing disk permissions; restarting mac. Nothing works !!! HELP please !!!