SQL 2008 (version 10.0.5794) cannot add field to replicated table without resnapshot

I am on sql server version 2008 (10.0.5794) and when I try to add a field to a table, it is not automatically added and propagated to the subscriber.  I have tried the following:

EXECsp_changepublication@publication='your_publication_name',@property ='allow_anonymous', @value='false' GO

EXECsp_changepublication@publication='your_publication_name',@property ='immediate_sync', @value='false' GO

And then running the snapshot agent but it resnaps the entire publication.

Is there an issue with the version that I am running sql server on with trying to add a field to a table or do I have a corrupt publication?