French Ad Bug
When I enter the French lesson, it lets me watch an ad to win "life" then goes to a black screen with an x in a circle in the upper right. There is no way to exit or to get into other Duolingo languages. I keep forgetting to go back to Duolingo because this is such an annoying, sloppy, unhelpful bit of programming. Until Duolingo fixes this, there is no way to continue with Duolingo on iOS.