Photoshop 21.2 Up date problems - Artboard dissappears when clicking away from app on macOS 10.15.5

Working with 21.2.0 on Catalina 10.15.5.

Since the up date I have only been using Photoshop to make artboards with text and photos.

Some of the initial problems have gone;

poor scrolling 

incorrect cursor in text mode,

mutliple vertical lines when moving images,

crashing,

Remaining, however,  is that the artboards dissappear when the cursor is clicked outside of the Photoshop window (on the desk top) or when another open file overlaps the Photoshop window.  The artboards return when I click on the move icon  or text icon accoring to the one last in use.

Thanks

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