Possible workaround
This may be anecdotal, but I got my refund/taxes owed monitor to come back simply by going to the left-column menu and clicking on the REVIEW tab (the one just below the State Taxes tab.) That made it pop back up in the left upper corner. Since then, it has persisted and has been working for me. If anyone tries that, please report back on whether it worked for you, too.
NOTE: If it doesn't show up after clicking on the REVIEW tab, it may be hidden underneath a link "Explain my taxes" in the top left corner. Click the little arrowhead next to "Explain my taxes", and it will make that move out of the way, revealing the refund/taxes owed figure underneath. Then you can leave that open. At least, that is what I observe in my situation.
