In questions where there is a choice of 3 translations into English, The check button doesn't work
The check button works, but the third answer covers it. You have to be very able, that you can push the check button. :)
I tried again many times on my laptop, and so did a friend, but no success. In the end I managed it on my mobile phone where the check button appears over the three possible answers. Unfortunately I can't get the accents on my mobile so I had a few 'typos'! I've tried to 'strengthen' the skill of directional conjugations, but that's no good on my laptop either.