Frozen terminal windows?

How do you unfreeze the terminal windows (bottom right 4 windows).
Control-C, Esc, q, quit, quit() do not work?

Hi @jfhauris, what do you mean ‘`Freeze’?
Control-C must stop any running program, otherwise try the top command look the pid of the process you try to stop and use the command

kill -9 pid_number

replace pid_number with the pid of the process. check this link out.

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You can also try loading a chapter with a different simulation. The terminals are restarted each time you load a new simulation.