We have been experiencing this issue for 2 years on a site with 18,000 users. It went quiet for a while but is now back, with multiple tickets in the last few days. This is what we found in LearnDash: The “resume video” toggle makes the topics get stuck during slow internet connection. i.e if student is watching video and during this period when internet gets momentarily disconnected or speed became slow, then upon video completion the jQuery function doesn’t load and the quizzes don’t appear and student gets stuck there. We found that a topic which got stuck had quizzes as “displany:none” and it could only become “display:block” if jquery function woks on video completion. So we believe that this happens due to slow or disconnected internet connection.
