User Settings changing on server...wierd!

Greetings, All -

Here's a wierd one. Whenever I set up users for FTP access, our standard
protocol is to uncheck "User must change password at next logon" and check
"User cannot change password" on the General Tab.

I have one client with two separate user accounts. A month ago, he called
unable to login to Account #1. Somehow "User must change password at next
logon" became checked. This conflicted with the second check box, "User
cannot change password" resulting in a lock out. This morning the same thing
happened with Account #2.

Any idea what's happening here? I have an idea, but I'm new to IIS and
would benefit from the experience of the group.

Thanks,
Dan