I agree the crontab mess has nothing to do with the password change dialog, but with the cron thing is definitely something wrong. I deleted the content of crontab but when I click save under konfig -> backup all the things reappear in crontab inclusive the error message “can’t install cron: bad day-of-week”.
UPDATE: It’s not only the backup-dialog it’s also with the register user and probably some more (I did not test more function yet).
Ok back to the actually topic: now I know why sending passwords did not work: I don’t use the send sms function, and if I don’t enter a mobile phone number but only the username and mail address, the message “Username unknown” appears.
So it’s probably designed to work only per sms. So I think I will change the message to something like: “Your username is wrong or you forgot to enter your mobile phone number” or something similar.