Clevershare error - no sound - fix

First, please make sure that the Mac, the Interactive Display, and the player (Youtube, VLC) are not on mute. If it's not the case:

In 90% of the cases forcing the app to close and reopen fixes the problem.

Right-click (click with 2 fingers, or press and hold Control while clicking) the Clevershare icon in your Dock and select Quit from the contextual menu that appears. Then, reopen the app, reconnect, and test again.

If the sound is still not going through, Quit Clevershare one more time, and open the System Preferences menu by clicking the Apple symbol in the upper left corner. In the window that pops up select the Security & Privacy and Privacy tab. Find and click on the Microphone option on the side and remove and check beck the tick next to Clevershare. 

Reopen the Clevershare app and reconnect - the sound problems should be gone now.