[Dovecot] file istream-raw-mbox.c: line 450 (istream_raw_mbox_get_body_size): assertion failed: (rstream->mail_size != (uoff_t)-1)

Hi list,

Today i tried upgrading my dovecot server from 0.99.14 to 1.0alpha3. Unfortunately the new version does not work. The log file says:

Oct 2 20:40:02 knut dovecot: imap-login: Login: user=<arved>, method=PLAIN, rip=213.225.30.218, lip=213.9.70.XXX, TLS Oct 2 20:40:02 knut dovecot: imap(arved): file istream-raw-mbox.c: line 450 (istream_raw_mbox_get_body_size): assertion failed: (rstream->mail_size != (uoff_t)-1) Oct 2 20:40:02 knut dovecot: child 98766 (imap) killed with signal 6

The Server is running on FreeBSD 5.4-STABLE, Client is Apple Mail 1.3.11 connecting via imaps.

any ideas, whats wrong?

regards tilman