Kwallet stopped storing new entries

I’ve been using Kwallet successfully for some time now, but for some reason it has recently stopped retaining new (manually entered) password information.

I have a number of log-in/password details stored, but since last week any new entries are only retained during the current session. If I log off, the new entries are missing when I next start Kwallet.

I’ve been searching around trying to find the cause of this problem, but so far can’t identify why it’s happening.

Has anyone experienced the same issue and found an answer?