There is a temp folder in the Bryce 5 folder that sometimes a copy is saved there but if you shut the program down I'm not sure it'll be there. I'm afraid to say that your scene is gone, unless someone else can think of something. When saving files it's a good idea to wait a bit after it says it's finished before even clicking a button or anything (I usually wait until the menu bar disappears) because that has been known to corrupt files. Switching display modes I'm not sure about, I haven't run into that but I may just be lucky. BTW welcome to the forum! It's a great place to be.