On Saturday, 9. May 2020, J Leslie Turriff wrote:
> 	I use tdewalletmanager as a convenience to store my passwords for kmail and
> konqueror (fish:).  Last night I refreshed my Trinity installation, and
> everything was working fine (through several login/logout iterations), but
> the second time I logged in today, suddenly tdewalletmanager didn't start,
> and kmail prompted me for my mail service passwords.
> 	I shut down kmail, then tried to start tdewalletmanager, but it would not
> start from the menu or the command line.  I was able to start it by
> using 'open with...' in konqueror on kdewallet.kwl, but though the file is
> 1.3K, kwallet manager shows no file tree!  It appears that tdewalletmanager
> can no longer read my wallet files.
> 	I noticed that the privileges for that file were set to -rw-rw-rw- and set
> them to -rw------ in case that was an issue, but that didn't help, though now
> I can start tdewalletmanager from the command line.
> 	What should I do to find out what's gone wrong?
> 
> Leslie
> 
I had such an issue some years ago. In my case kdewallet4/5 has "migrated" my kwallet in a new format, unreadable for tdewallet.
In my case I was able to restore the file from backup. I was also able to open the file with kdewallet5.

Stef