One or more master keys need a password

Hi. I have an orange error across the top of my window that I'd love to lose!

Joplin 1.14.19 on Linux Mint 20.0

I looked at the various suggestions in the forums here and tried to change the password which shows a red cross in the password field.

Unable to change password - any editing of the password field appears to fail

I set the notes to unencrypted, and things changed...

Bit while I've now added a new password, the old one still exists...