After entering the Vault Password, the Unlock Wheel turns forever


after misstyping my password, I retyped it (correctly - checked with the “eye”-function). But now, the “Unlock” button turns grey and the wheel next to the unlock button turns for more than 20 minutes now, but the Vault does not unlock. Any ideas how to solve this?

I use Version 1.5.5 and Drive-Type is WebDAV.

Thank you