I had completed a lesson that day and didn't realize it wasn't actually submitted due to this glitch. The next day I discovered my 376 day streak was unfairly ended.

It seems there were others also affected due to this.
https://www.duolingo.com/comment/5077880

I had it happen as well. Pressing the final continue after testing out a lesson led me to Error 500 page (instead of the congratulatory screen, the mean owl!), and couldn't access anything on the site for a couple of minutes. This site http://www.isitdownrightnow.com/duolingo.com.html said it was up and reachable at the same time I was seeing the error, thought it was a problem on my side.

I am trying so hard to listen to and speak Spanish and this constant irritating background advertising just totally distracts and irritates me. I am so sorry you had to do this and it makes it harder to learn. Is there a way of shutting it off?

idk ask it if it still loves you or if it is mad at you