It might have something to do with release note:
5280.5 Password timestamp synchronization issue
There was an issue where a user logging on to two different machines could have
their password reverted to a previously used one.
This has now been resolved by amending how the password change information is
I believe that it is a new plugin that will display a 'password changed' message whenever the EEPC users' password is changed by being synchronised to a Windows (changed) password.