There is a strange bug while running this app that also seems to affect other volume related apps too. When I do 'show desktop', non of the desktop icons are clickable, if I quit the app, the icons on the desktop are clickable again.

By 'show desktop', I mean the gesture (four fingers pinch out on the trackpad) that temporarily move all the windows away and reveal the desktop.

See the description of show desktop here
https://discussions.apple.com/thread/255875028?sortBy=rank