Kokua Release FTRLV 126.96.36.199679 (64bit Windows 10 Pro latest) - when you switch your Windows sound device or enable/disable it (e.g. switch between HDMI via display, USB headphone, bluetooth headphone, external USB soundcard...) Kokua looses sound and does not pick a new device back up again while other applications do detect a change in sound device and keep on working. The Kokua application also dissapears from the Volume Mixer list. You have to restart Kokua to get sound back. Other viewers dont seem to suffer from this (like FS).
Please improve the sound system such that it keeps trying to re-open and use the (default) sound device even when there was an error before.