Hello!
After I upgraded Windows 10 from version 1803 to version 1809, multichannel audio recording stopped working. Only one audio track is recorded. Earlier there was an audio track from a microphone and an audio track from a game - I record the games. Now only the audio track from the game is recorded with the same settings. There is no audio track from the microphone. A check mark on "Multi-channel sound recording" is worth it. Previously, before changing the version of Windows 10, there were 2 audio tracks in the recorded file, after changing the Windows version in the recorded file, there was only one audio track.
I have been working with the program for 2 years already, such a problem appeared after updating Windows 10 to the new version.