New Microphone UI
I don't get it. I don't know if I have to hold the button or press it and then press stop or if it will try to interpret on the fly, but I haven't gotten a single microphone answer correct since the new UI took effect. Maybe if, like with the mobile version, there was an indicator of the sound being recorded and when the program was actually interpreting, this would work better and be more intuitive, because as it is I can't tell what is causing successful recordings.
I've encountered these problems with the Spanish lessons on Linux using Iceweasel 20. Haven't tried microphones for German under the new UI yet.