Today I keep getting "404 Page not found!" when clicking on the link to the study in the forum. I can see the first chapter of study, as usual... but once I click it, I get 404 error. I tried on many browsers and accounts - my students, who use it also to practice tried and it doesn't work. It's strange because I use it for many months without the problems. Also the links work normally if I put them into the browser. What happened?
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