After schema update , Replication is breaking without raising error

This is SQL Server 2005 Transactional replication configuraiton.

I am modifying the table schema at publisher by adding addtional columns on publisher table and the schema is replicated over to subscriver without any problems. But when I am inserting values into these new fields by using the below query: UPDATE dbo.event
SET block_ = 1, fuel = f_used
Values are not getting replicated over to subscriber. But the replication monitor does not report any problem even though after this update, replication is not functioning (i.e.) any modification not getting transmitted over to subscriber and breaks is in inconsistent state.

Here is the table properties set for this article. EXEC sp_addarticle @publication = N'Publication_Db', @article = N'event', @source_owner = N'dbo', @source_object = N'event', @type = N'logbased', @description = N'', @creation_script = N'', @pre_creation_cmd = N'drop', @schema_option = 0x000000000803509F, @identityrangemanagementoption = N'manual', @destination_table = N'event', @destination_owner = N'dbo', @status = 24, @vertical_partition = N'false', @ins_cmd = N'CALL [sp_MSins_dbo_event]', @del_cmd = N'CALL [sp_MSdel_dbo_event]', @upd_cmd = N'SCALL [sp_MSupd_dbo_event]'GO Can Some one please let me know, what is the way to do this kind of change.

Thanks.

As our publications size is huge , we cannot generate snapshot agent. So to avoid this , we configured our subscriptions to use "REPLICATION SUPPORT ONLY" option.
My guess is , as we are not updating the table by referencing Primary key column, so the replication does not know, what to update.Thoughts ?
UPDATE dbo.event
SET block_ = 1, fuel = f_used
Thanks.