Regarding scenes not being able to be re-opened after crashes, leading you to have to re build from scratch..
I have found that when Daz crashes (only to get a message about not being able to re-open it), Try opening the scene in Daz Studio 32 bit (re save the scene) and then open it in DS 64 bit.. Cant guarantee it will work for you UruMike but it works for me

EDIT: It does seem like I loose some of my Octane mats/textures & env light settings during this process and have to re-apply them though
