The 1941 crash may be related to the same issue that Hendriks saw. If you email a zipped save game to alf@melachea.demon.co.uk then I'll take a look at it and fix the known issue, then send the save game back to you so you can continue playing.
There was some discussion a while back about the 1936 crash soon after Ethiopian Freedom Fighters event. Generalisimo re-wrote the entire event chain so I think this will not happen in 0.2 release of C.O.R.E.
About Japan, you need to pick Elect Right in the 1937 election. If you don't then the war never starts or at least not until you reach 100 WE. I'll include a Marco Polo Bridge event in 0.2 that pretty much ensures that Japan will go to war, it works well but IMHO it makes war a little bit too certain
There's a balance to be found between having every game turn out historical and having some games throw up surprises - in the long run you might want more of the latter to keep interest in the game (it's basically historical accuracy vs game re-playability).
There was some discussion a while back about the 1936 crash soon after Ethiopian Freedom Fighters event. Generalisimo re-wrote the entire event chain so I think this will not happen in 0.2 release of C.O.R.E.
About Japan, you need to pick Elect Right in the 1937 election. If you don't then the war never starts or at least not until you reach 100 WE. I'll include a Marco Polo Bridge event in 0.2 that pretty much ensures that Japan will go to war, it works well but IMHO it makes war a little bit too certain