Got it. Loaded it up and it ran past 1st April ok... How does this history log compare with yours if you load up the game and run it until it crashes?
1938-02-28 : 21:00 March 29, 1938 : Soviet Union went with Yagoda is a trockist! in Man of Steel - removing Yagoda.
1938-02-28 : 21:00 March 29, 1938 : Germany went with Issue the coupons in Transport for the Masses!.
1938-02-28 : 21:00 March 29, 1938 : Germany had You have opted to deliver the coupons .
1938-02-28 : 21:00 March 29, 1938 : Switzerland went with Purchase the Me109s in Switzerland Purchases Me109s from Germany.
1938-02-28 : 21:00 March 29, 1938 : Afghanistan went with Create the Afghanistan Bank in The Afghan Bank and Modernisation.
1938-02-29 : 0:00 March 30, 1938 : The 6a Divisão de Infantaria is now ready for deployment.
1938-02-29 : 0:00 March 30, 1938 : The 7a Divisão de Infantaria is now ready for deployment.
1938-02-29 : 0:00 March 30, 1938 : The 1a Divisão Motorizada is now ready for deployment.
1938-03-00 : 23:00 April 1, 1938 : Turkey have been hardly influenced by Soviet Union.
1938-03-02 : 4:00 April 3, 1938 : Ireland went with We have a fair deal in End of the Economic War-Ireland.
1938-03-02 : 4:00 April 3, 1938 : United Kingdom had End of the Economic War-Ireland Agrees .
1938-03-08 : 0:00 April 9, 1938 : Our scientists have developed 'Cavity Magnetron'.
1938-03-11 : 0:00 April 12, 1938 : Romania have been completely influenced by Italy.
1938-03-23 : 0:00 April 24, 1938 : Our scientists have developed 'Basic Divisional Signal Command System'.
1938-03-24 : 1:00 April 25, 1938 : Turkey have been hardly influenced by Soviet Union.
1938-04-01 : 6:00 May 2, 1938 : Romania have been hardly influenced by Germany.
1938-04-02 : 3:00 May 3, 1938 : Romania have been completely influenced by France.
EDIT: Can you just confirm as well this save game is from HOI 1.04 + C.O.R.E. 0.2 + hotfixes from last night? Was the game started after applying the latest hotfix? The AI settings are saved in the save file itself rather than reloaded from AI files so the latest hotfix pack would not update AI for a game in progress.