[Zope] Can't change user roles without password

Somewhere along the way, the acl_users/Contents form has decided to quit filling in the value of each user's password, so that their roles can only be assigned if a Manager knows their password...I've got new installation running Zope 2.2.0 and a new CVS PTK release on another box that does it correctly, but I can't determine what's the differentiating factor by comparing them. Any ideas on what I did to cause this, or more importantly, what I can do to fix it? I'm using... Zope 2.1.6 (binary release, python 1.5.2, win32-x86) PTK 0.7.1 WinNT 4.0 SP5 Thanks, Dave.