Updates ruining learning record
This is not funny, Duolingo. I have toiled my way up the ladder for weeks and then one beautiful day you just "update" the tree with "new skills". The way it is done (beyond learners' control) is really not appreciated. I cannot see the merit of changing the horses while crossing the river, especially when the Esperanto learners have been faced with such a drastic update. Why could that not be done without loosing all progress in so many old skills? Why the new content cannot be added seamlessly, say with an option to restore the skill with 20 or so additional questions not the whole 5-level drill??? You have really succeded in undermining many learners' motivation. We are not amused.