Duolingo failing to start on iOS 7.1.2
Having been using Duolingo on iPhone 5 for several month with no problem, until today when I attempt to start the app a green splashpage with "Duolingl" shows for a second, then disappears and back to iPhone current apps icon. If I scroll through running apps (only one other running) I can see that Duolingo app is running, but when I try to access it, the lesson screen (happens to be Spanish Occupations Strengthen) shows for a second, then disappear. Trying to quickly tap the screen before it disappears doesn't take me to the lesson or back to lesson menu.
I have just experienced this problem even though it had been working ok for many months. I checked the memory usage and there was very little free memory available (I had a lot of apps opened) so I removed some unused apps from the RAM and DL started working again.
If this us the problem with everyone else then perhaps DL needs to at least display a warning if there is insufficient memory to run.
Upon review, I see that I also updated to Duolingo version 4.0.4 on the 12th, just a few days ago. Is this the culprit? Did anyone else having this problem also recently update? I have a ticket in with their helpdesk, but no help so far. Getting close to removing the app and reinstalling..