imapd 2.1.15 + sasl2: exits on signal 11 when trying to authenticate

[Chris Hastie]

I'm trying to get imapd 2.1.15 to work on a freebsd 5.1 machine with 
SASL 2.1.13 (I think)

Imapd respond to connections but dies whenever an attempt is made to 
authenticate to it:

Oct  6 22:22:14 ash kernel: pid 27479 (imapd), uid 60: exited on signal 
11
Oct  6 22:22:14 ash master[27475]: process 27479 exited, signaled to 
death by 11

I'm using sasl_pwcheck_method: auxprop and sasldb2 seems to be in order. 
Any ideas?
-- 
Chris Hastie