I found a visual glitch when dragging the right part under the tabs "fixtures", "Steps" and "generator" wider or narrower.
My mouse cursor than changes from arrow into "Move left or right" (see) and stays that way even when going to "Live" and hitting a scene button.
Only way to get the "Arrow" view back is hitting another button board or my desktop. This happens on both Mac's with macos Sierra and V.8.1.25.