When I try to quiz kanji lessons or my kanji schedule, I get redirected to the main page. This happens just in beta.
The only message that appears in the console is "DevTools failed to load SourceMap: Could not load content for https://www.renshuu.org/sub_dragdrop.min.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE", but I don't think it's related since I also get it for Vocab quizzing, which works fine.
