A customer abroad pointed out a problem to me by email. In some environments the UI, the DSP and the DAW did not stay in sync, so basic features such as MPE and routing did not work. This may have caused trouble for several of you. I am very sorry. The problem is fixed in the latest build, so please update.
As always, you bought IMFMSynth trusting it across distance and language barriers. Having cleared that hurdle, you should not then meet carelessness on my side.
Once again, I apologize. I will keep developing IMFMSynth, and I appreciate your continued support.