In previous updates, the notes that synch with mureno.io were broken. Now, with the latest update 1.12.3 stable-FP4 there is no more error message, but the notes are not synchronised. It keeps on showing the “waiting” circle. If I try to add a note (+ sign at bottom right) it says “Account not yet configured” (in Dutch). The menu (top left) is empty and the user icon (top right) does not respond.
Clear cache and data of Notes app and reopen it. It will re-logs you on and it should be fine.
Thanks - I had to look where I could do that, but of course that can be arranged in the settings>applications sub menu.