>Some of the tables use identity columns marked at "Not FOR REPLICATION" per the SQL documentation. Some tables use GUIDs. When replication begins I receive an error 8102 "Cannot update identity column ." from distribution agent in SQL. My reading of the SQL doucmentation was that identity columns could be updated by replication. Any ideas why it won't update the identity columns?

Do you have 'NOT FOR REPLICATION' set on all identity columns in the subscriber database?