We have several Windows 8.1Pro laptops that we have setup with full drive encryption using Bitlocker that is included in the O/S. All of the pc's have two users, an administrator and a standard user. Policy editor was used to prevent standard users from changing the pin. One of these machines is having problems with the pin. This shouldn't be a changed pin as she doesn't have access to the admin account. A few days ago I tried to log in myself with the correct pin and it would not allow the pin and then it did. Both times the pin was correct (insert allows the typed pin to be viewed). Yesterday I used the recovery key to access the system. I reset the pin and saved it to a file on my usb drive. I rebooted a few times to verify that it worked. This morning we are back to the same problem. Incorrect pin. Help!