Code not running

Does anyone have any ideas why code doesn't run some of the time for some users at my school? It's like something isn't rendering. is allowed at the firewall and I can't see any explicit blocks

When this issue occurs, just "center" appears in the win. Occurs in Chrome, IE etc.

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Input doesn't work in turtle repls, just put your code in a normal python repl without turtle and it should run just fine.