No subject

Sometimes during the first try the status message is that X messages were 
downloaded in 0 (!) KB. The second try gives the correct number of messages 
with the correct size, the third try gives the error.

With another POP3 account I get:
"Could not login to XXX. The password may be wrong.
The server said: "[IN-USE] Unable to lock maildrop: Mailbox is locked by POP 
server"

kio_pop3: pop3_open()
kdeinit: Got EXEC_NEW 'kio_pop3' from launcher.
kio_pop3: POP3Protocol::POP3Protocol()
kdeinit: Got EXEC_NEW 'kio_pop3' from launcher.
kdeinit: Got EXEC_NEW 'kio_pop3' from launcher.
kdeinit: Got EXEC_NEW 'kio_pop3' from launcher.
kio_pop3: POP3Protocol::POP3Protocol()
kio_pop3: POP3Protocol::POP3Protocol()
kio_pop3: pop3_open()
kio_pop3: pop3_open()
kio_pop3: POP3Protocol::POP3Protocol()
kio_pop3: pop3_open()
kio_pop3: pop3_open()
kio_pop3: greeting: mail.XXX.ro Cyrus POP3 v2.2.12 server ready
kio_pop3: Trying USER/PASS
kio_pop3: greeting: mail.XXX.ro Cyrus POP3 v2.2.12 server ready
kio_pop3: Trying USER/PASS
kio_pop3: greeting: mail.XXX.ro Cyrus POP3 v2.2.12 server ready
kio_pop3: Trying USER/PASS
kio_pop3: greeting: mail.XXX.ro Cyrus POP3 v2.2.12 server ready
kio_pop3: Trying USER/PASS
kio_pop3: USER/PASS login succeeded
kio_pop3: pop3_open()
kio_pop3: Reusing old connection
kio_pop3: greeting: mail.XXX.ro Cyrus POP3 v2.2.12 server ready
kio_pop3: Trying USER/PASS
kio_pop3: Finishing up list
kio_pop3: Couldn't login. Bad password Sorry.
kio_pop3: Couldn't login. Bad password Sorry.
kio_pop3: Couldn't login. Bad password Sorry.
kio_pop3: pop3_open failed
kio_pop3: pop3_open failed
kio_pop3: Couldn't login. Bad password Sorry.
kio_pop3: pop3_open failed
kio_pop3: pop3_open failed
                                                     
I have to say that the password is OK in this case.

Both accounts worked fine until I recompiled all my KDE, including KMail from 
the above revision.