Can you please post a feedback.... on top of my last email I would still check as follow:
a) try to Slave the drive using USB enclosure not via eSata as the eSata will be treated as internal drive
b) try to check if you list a users with (pgpwde --list-users) if you had or have a WDE-ADMIN (security group). Having the user in this group you could run the recovery command with this user.
c) you could still try to Slave the drive to another machine with PGP Standalone version installed WIITHOUT disk encrypted on it and check if running --recover fail or not