PGP Whole Disk Encryption (WDE) allows regular passphrase users and Single Sign-On (SSO) users.
There are a few scenarios where this has occurred that can prompt this behavior:
In the first scenario, a user’s Windows or Domain password has expired. Once this has been detected by the Windows login process, in order to login to Windows, the user must first change the Windows password. Once this has completed, this behavior will no longer be seen.
The fix involves adding a "Switch User" button such that users can click the button and login with the new Windows password, or change the Windows password as applicable.
NOTE: In versions prior to 10.2.1 MP2, the workaround if the system has halted at the PGP SSO user is to put the system to sleep, then wake it back up in order to switch the user account.