When I try to use this lesson, the code window appears to be blocked by a field the same color as the background. I say blocked because the first character appears, but the second character seems cut-off about 1/3 of the way through it. So "NN" looks like "NI". No further characters can be seen, but they seem to be typing in correctly. Also, the line numbers do not appear. I've tried on different computers, at different locations with different internet connections, with different browsers, all sorts of things. I submitted bug reports about this a month and a half ago, but it's still preventing me from working.
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