Program non-responsive


In the first task "Wellcome!" the page keeps loading, and it won't let me do anything.

I have already updated my browser, and i run macOS Sierra V. 10.12 (16A323) (the newest). I have deleted my history, cookies and all programs like AddBlock. I have whitelisted all the websites that the Q&A said.

It's the first step, so it's to early to write codes

I would expect that the loading symbol would disappear

Please help. I don't know what to do. 



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