Thanks for the incredibly fast answer. Good news, I just logged in using a different browser and it shows again. Logged out and logged back in using Opera browser - still nothing is shown. So it turns out it wasn’t that the board got wiped as a problem with the Opera browser. Opera was working last week (its how I created the board), so not sure what changed.
Anyway, thanks again, at least I am getting by on another browser so this went from a LEVEL 5 - OH NO! to, hmmm that’s weird and unfortunate but can be worked around.