Just bought premium, and all text on every lesson is hidden (the text is written in the same color as the background)

I just bought premium and it looks like none of the lessons work? The text is written in the same color as the background, so nothing is actually readable… Is this a known defect of the site that’s currently getting worked on?
Please see the attached picture for reference. Certainly not a great start to the premium experience so far.

That looks strange, it’s not the text issue, it seems like the text is stuck on loading. What browser are you using? Can you try to logout/login back to your account and give it another try?