I had a quick look in one of my active websites and all my IsSystem values are 0 as well. Did you remedy those anomalies you identified in the Tabs table? Every record should have a value in the following columns, PortalID entry, TabID, TabOrder, TabName, IsVisible,IsDeleted, SiteMapPriority, PermanentRedirect,IsSecure, Level, TabPath, HasBeenPublished, IsSystem. Fill in the missing values. Sort the table by TabID and look to be sure there are no duplicate TabID values. (should be impossible)
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