Yup it is a bug. I hope they can fix it soon. I fooked up our PDC reinstalling to 1.4. I tested it on VM but not extensively. Got so excited with the Master/Slave thing.
Note to self: Test everything in VM before going into production.
Saturn2888: does your LDAP Master/Slave work with Samba PDC? Can all your WinXP workstations log in the domain?