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Important for importing saves!:
Your Chapter 4 saves should work if you've saved before the credits started but after any quick time events.
Due to a change in game timers, the game will crash if you try to do a quick time event in Chapter 4 without doing the unaware insertion scene in the bathroom from Chapter 3 (Chapter 5 has no quick time events, so feel free to ignore unless you want to replay Chapter 4). This is because your save has info from the old timer code saved from Chapter 3 that conflicts with the new, more consistent timers. Fix it by playing through the bathroom insertion scene in Chapter 3.
Remember, holding the Ctrl key will let you speed through sections of the game you've already played.