The ExcludeFromRecentContent field in the mp_Blogs table should have a default value of 0. I do not know why yours does not.
You should use the table designer in ms sql management tools if possible to add a default value there to fix the problem.
Actually the update stored procedure mp_Blog_Update should also set that value (the default would be needed for insert) so it seems like your database has been messed up like partially upgraded or mismatched with code version and schema version.
Hope that helps,