Build 21 loss of Tidal

I have just upgraded to Build 21 and I seem to have partially lost Tidal. If I look at my existing music, I get albums with the Tidal logo in the corner. These albums play happily.
However, if I go into the Tidal menu on the LHS of the screen, I don’t get any music showing. If I go into play lists and select any of them I can get into the sub menus - Moods, Relax etc but no music shows and all I get is a ‘loading’ message at the top of the screen.
This is the same for the ‘Tidal Rising’ and Your Favourites’ tabs.

Is this just happening to me???