Shell does not show typed in commands, "reset" works, but what happened?

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http://askubuntu.com – My problem is that the Bash shell stops showing the characters I type into it. It does read the commands though. I've come across this problem quite a few times and I don't understand what causes it. I know how to solve it, but I really don't like it when I'm "voodooing" my way of out of problems. I'll describe the two ways I've come across this problem: I'm running a certain process, http://pythonpaste.org/script/ and sometimes when I stop that or it breaks control is given back to the shell. When I then go and type commands into the shell, the characters I type don't show up. When I press (HowTos)