Redhat 7.1 PAM authentication problem (new)

[Oyku Gencay]

Hi,

I've successfully installed and set up Cyrus to authenticate from PAM by
1. changing group of imapd to shadow
2. changing group for /etc/shadow to shadow (it's root by default) and chmod
g+r

Whenever I change a password for a user (with passwd) The /etc/shadow looses
the grop and g+r attributes. Does any one have encountered this problem?

If  this is inevitable, where is the documentation for sasldb with pwcheck.
I'd be glad if you could send me some pointers

Regards,
Oyku Gencay