Yes I have exactly the same problem and I gues that few others also have because there is couple of similiar posts as you and I have posted. So it might be just a problen bug.

Hi I have some problems with the melodic sight-singing. My problem is that Earmaster gets my audio signal but it doesn't recognize the pitch. I have tried to do the melodic sight-singing with my guitar and synth but neither of them haven't worked.I know that the signal is going to Earmaster because ...