Why is Mavericks forcing a password reset on every lock screen? I just upgraded to Mavericks. Now, every time I wake it up from the lock screen or standby and proceed to type in my password it rejects it.

To get back in I have to select "switch user", then type in my username and the (same) password. Afterwards it requires me to set a new password and only then it lets me in.

This is, as you might imagine, very annoying. How can I get rid of this new security requirement?
I figured it out. Somewhere during the upgrade process the password policy maxMinutesUntilChangePassword was set to 100. So every 100 minutes I had to reset the password...

To solve it I used the pwpolicy command:

pwpolicy -u "MyUserName" -setglobalpolicy "maxMinutesUntilChangePassword=86400"