I'm getting this error when trying to join a server: No default audio input device available for voice chat. Check your OS's settings and verify you have a device available. Raised as an issue on the Github project for tracking, if anyone else sees this and wants to add to it. https://github.com/TheHellBox/KISS-multiplayer/issues/67 EDIT: Can confirm that plugging in a headset circumvents the issue, in case anyone else has this issue and hasn't read the Github issue. Looks to be a bug.