Hi,
This is a known issue. PGP Desktop 10.2 and PGP Universal Server 3.2 now use Detailed bootguard authentication on the mac. There is a problem where the username field requires your display name on the mac rather than your short name (usually maps to CN or SAMAccountName in LDAP).
As an example, let's say you have a user called Joe Schmidt and his username that he logs in to the mac with AD on is jschmidt. But his display name in Active Directory is Joe Schmidt.
After installing PGP Desktop 10.2 and encrypting the disk. You will be prompted with the new bootguard screen asking for a username and a password. For the username, you will need to put in:
Joe Schmidt
Not Jschmidt. I realize that this is a major inconvenience and they are working to resolve this problem in a future update. But please be aware of this change in the meantime.
As a workaround, you can always use simple bootguard authentication (legacy) which will change the behavior of bootguard to work the same as it has in previous versions where it only asks for the users passphrase.