[Roy Dennis]

Select Tools/ Audio Controls. Where it shows Playlist audio card is a dropdown arrow, if you have more than one show when you click that dropdown you need to select the one you want to use, normally speakers or headphone jack. But this depends on whether you normally use an external sound card.
Whichever you display as your Playlist sound card you should make the default play list card in Windows. To do that select the Black "Manage Audio Cards" button which will take you to Windows audio controls, select the "Playback" tab, then highlight the card you want as your default Hoster sound card, does it show as "Default device" ? if not then you should see a button at the bottom "Set Default" press Apply and OK.
Now double check that the Hoster's audio control is still showing Playlist audio card as the one you made the default then press OK.
Let us know if that fixes it for you.
If you use an external sound card like a usb one and you start Hoster without it connected you should be prompted with a warning that your sound card has changed, This can also happen if you are using an HDMI connection as the HDMI also passes sound so if you are using an HDMI connection for your external monitor but want your sound out via the speakers or headphone out it is a good idea while in the Windows sound settings to disable the HDMI audio, this will not affect the video signal.