Questions and answers get out of sync half way through a session
I've never had this problem until about a week ago but now it seems to happen almost every practice session I do. Everything works fine until half way through and then the answers become out of sync with the questions - giving the answers to previous questions instead.
This also means that wen there are audio questions, the audio doesn't play, so I have no chance of answering the question right and have to lose a point to progress.
I've also found that sometimes when it's like this, half of the times or more when I get an answer right, the bar at the top will not move/improve, so it could take me several correct answers until the bar finally moves that last little bit to complete the module (which should have taken one correct answer).
Is any one else having these problems? Is there anything I can do about it? It's becoming quite irritating and makes practicing far less productive than it would normally be. Help please!