cannot change a password, Problem with pam_chauthtok

I cannot change a password any more, I get always
XXXX# passwd
pam_chauthtok: Shared object load failure.

Same if I try it as root. I had "shadow" and I converted back to normal passwd but always the same result.

Any ideas what to check? Unfortunatly "reboot" is not an option.

Best Regards

PS: HP-UX 11.23, Patchbundle Sep 2004