I attach screenshot showing that if the Master Bus is reached by use of the Up or Down arrow keys, the VI panel from the previous page shows (pictured in the 1st screenshot) instead of the Mixer (pictured in 2nd screenshot).
I can't see anywhere to attach images to this page, but there is an option "Attach files to this post?" at the foot of this window, so I will post and hope an option comes up to add files. Aha! It did, and here I am back again ready to post. Great job on rebuilding the site!