I went back through our old software data in CCH and UltraTax for these tax returns. The only difference I can see between that data and ProConnect is that CCH and UltraTax have no data of any kind for beneficiaries whereas ProConnect requires the Type of Entity for Illinois even when there is no beneficiary. I suspect that this is triggering the Illinois diagnostic. The only solution may be to paper file the Illinois return unless there is a way to eliminate the default data.