Is this a new installation or an upgrade? Have you packaged your own custom features with it (and your own sql scripts) or is it just including mojoportal?
If its a new installation I would start with an empty db (ie delete all tables and stored procedures) and make sure that there is only 1 file in the /Setup/applications/mojoportal-core/SchemaInstallScripts/mssql
It should only have 2.2.6.7.config in that folder and no other files.
Hope it helps,
Joe