I did not listen to the warnings. I suffer the pain of wasted time but now I know. Back to SQL Server 2012 for historical data testing only. See the reason why here:
SQL Server 2014 CTP 2 will be abandoned due to pre-release with too many data querying restrictions and wonky compiled stored procedures – See more at: http://quantlabs.net/blog/2014/02/sql-server-2014-ctp-2-will-be-abandoned-due-to-pre-release-with-too-many-data-querying-restrictions-and-wonky-compiled-stored-procedures/#sthash.Gf15BBhW.dpuf