Have you clicked off the window? I was facing the same issue, but that was because I had the HONK window selected. If you choose a different window, it should track. Hope this helps!
I have just bought the soft today and I have the same problem, even with the preset characters, eyes blink but the mouth doesn't move. Yet, my microphone is recognized since the gain bar goes up and down with my voice.
After researching furthur in my settings, it appears that I had many devices identified as microphones. After disabling them to keep only my main mic, it works everytime for the moment !