[Dovecot] Dovecot SQL auth problem? (1.0-test52-56)

Hi there, We are living dangerously and using the test versions on our production servers which are migrated from 3 different older servers (about 5000 accounts) therefore we have 3 different MySQL auths. All seems to be ok, but a guy in the office is using Thunderbird as pop3 access. The auth is saying:

auth(sql): plain(?,xx.xxx.xx.xxx): invalid input

I have hidden his IP for security reasons. The login should be user@domain.co.uk and his account works fine with outlook.
With test 52 this killed the auth child with signal 6 and 11. Anyone have any ideas?

Unrelated to this (I hope) we are also getting quite a few child xxxx (pop3) killed with signal 11 several times a minute.

Andrew Hutchings Systems Operator / Developer / Linux Guru Netserve Consultants Ltd. http://www.domaincity.co.uk/