Is filevault compatible with LDAP configurations?

I turned on FileVault (on my Enterprise attached Mac) and it's no longer prompting me for my LDAP credentials. After the filevault login, it just tosses me straight into local administrator. LDAP still shows as on and "working", but does not appear to be.

My old Mac (with an old OS) used to ask me for the admin filevault password, followed by my LDAP password, and then continue on by logging into the appropriate LDAP user account.

Have I missed some configuration step on the new Mac, or has there been a change in how the newest OS X handle filevault+LDAP?