Duolingo users have taken to the app’s subreddit to complain about a change that has disrupted the progress of many. This time, it’s not the energy system, AI updates, or the owl mascot’s incessant scowling to continue your streak. Rather, course updates have left many Duolingo users stranded on their learning paths.This kind of disruption remains a core reason I left the app in the first place. I’ve been free of the green bird for almost a year — but my dissatisfaction with Duolingo started when a course update ruined my learning progress.