dovecot - Jul 2007 - assertion failed & invalid password field

I'm getting these in my log:

Jul  6 09:52:51 postamt dovecot: imap-login: file ssl-proxy-openssl.c: line 460
(ssl_proxy_new): assertion failed: (fd != -1)
Jul  6 09:52:51 postamt dovecot: child 31576 (login) killed with signal 6
Jul  6 10:37:44 postamt dovecot: imap-login: file ssl-proxy-openssl.c: line 460
(ssl_proxy_new): assertion failed: (fd != -1)
Jul  6 10:37:44 postamt dovecot: child 25241 (login) killed with signal 6
Jul  6 13:14:51 postamt dovecot: imap-login: file ssl-proxy-openssl.c: line 460
(ssl_proxy_new): assertion failed: (fd != -1)
Jul  6 13:14:51 postamt dovecot: child 4418 (login) killed with signal 6

and I get those for accounts I deactivated using "usermod -L", maybe
dovecot should log something like "account disabled" instead:

Jul  6 11:07:01 postamt dovecot: auth(default): shadow(vnedwed,77.128.63.72):
invalid password field
Jul  6 11:07:06 postamt dovecot: auth(default): shadow(vnedwed,77.128.63.72):
invalid password field
Jul  6 14:12:40 postamt dovecot: auth(default): shadow(jechafch,141.42.4.251):
invalid password field

This is dovecot-1.0.1

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