Ok, that’s good. I had that issue 4 times in 1 month and each time was the same. I would leave the remote on the Queue screen and something happens that causes the Blank Screen condition.
I’ve read a few posts that indicated the issue seems to occur when the device screen goes to sleep and the queue ends. When they wake the device up the screen is blank in the center with the top and bottom bars containing what I mentioned above. I’ve had it happen when the device was awake 2 of the 4 times it happened to me. Someone on the site mentioned the Keep Awake option in the roon setup screen and I did enable that option because I like the way it works. It keeps the screen awake when Roon is in the forground but allows the normal sleep actions when Roon is in the background.
The last time this issue happened, the first thing I did was select Menu then Overview, which puts that back as the first in the chain, and I thought it was a workaround, but found out Overview was not functioning normally. New additions to my library did not show up in the Recently Added section. The only way I know of to correct the condition is to delete/reinstall the app as you have confirmed.