I've been using Dovecot on 2.6.0-test1 for quite awhile but today I jumped ahead to test5 and it broke in the way you described. http://dovecot.procontrol.fi/list/dovecot/2003-July/001943.html

I used your workaround and now everyone is back in business. Thank you for the help! (I was sweating there for a bit.)

--kyler