sasl 2.1.15 - applications crash when authenticating

[Chris Hastie]

I've been trying to get Cyrus imapd 2.1.15 installed on FreeBSD 
5.1-RELEASE machine. Initially I used cyrus-sasl 2.1.13 because that is 
what is in the ports tree for 5.1 (although it is broken when used with 
MySQL 4). I've just tried using sasl 2.1.15 but still get the same 
problem.

That is, when a user tries to authenticate to imapd it dies with a 
signal 11, or on authenticating to Postfix the cause of death is 
reported as signal 6. Either way, authenticating to either app is 
impossible.

I'm using auxprop, have checked permissions on sasldb2 and have trawled 
everything I can find for answers and go no where. Perhaps I'm just 
looking in the wrong place, but some help here would be greatly 
appreciated.
-- 
Chris Hastie