It sounds like somehow the part of the upgrade script that populates the new columns did not run.
I would run this manually:
UPDATE mp_Pages
SET PublishMode = 0
GO
UPDATE mp_Modules
SET PublishMode = 0
GO
the above is taken directly from the upgrade script at
/Setup/applications/mojoportal-core/SchemaUpgradeScripts/mssql/2.3.6.7.config
so it should have run during the upgrade.
Hope that helps,
Joe