Safari - Strengthen Skills - Freezes at end
that happens to me quite often too, it's very annoying so I hope it gets fixed soon!
That happened to me yesterday. I usually use the iOS app to do lessons but I was just trying the new web interface and it hung on the last response. Duo seem to have started using Adobe Flash to handle the listening and speaking exercises and Apple are not very happy about Flash. That's why I was testing the web interface, but I will stick to the IOS app for the moment.
That happens to me rarely. Perhaps a lingot will make you feel better :)
This has just started happening to me in the past two days, also to my husband. We are using Chrome in a Windows 8.1 OS. Duolingo needs to fix this! I'm giving indycliff a lingot as well for reporting the issue initially.