2.1.5. New Dashboard requires pin when no pin defined

I've just defined a new dashboard. The 'requires a pin to open field is empty.
When I go into the tile to define some devices it says I need to enter a pin.
I press submit without entering a pin and the blank dashboard opens. I cannot do anything with it.
I've tried defining a pin and then deleting it but nothing changes. Any thoughts or ideas on how to get round this?
I'm running 2.1.5 and have not had this issue before.
Thanks.
EDIT. When I put define a pin and then put the pin in to open the dashboard it says the pin is incorrect.
Well this is strange. Everything is OK on my second hub.
Tried a reboot of hub but just the same. Hmm.

Not sure what's going on but I deleted the dashboard and redefined it with a pin.
Then deleted the pin and everything is now ok.
Hey ho. One of those things.
All's well that ends well. :smile: