I kept closing apps by mistake until I understood how it works in pr1.1. I tihnk it's actually better now since you can actually find out which way it is. In pr1.0 there were some games that looked like landscape and were actually portrait etc. Now it's pretty clear.

Something that you have neglected to say or not noticed perhaps is that in pr1.1 if the phone is flat on the table, then it uses the method from PR1.0, eg. You swipe from the applications top instead of the phone's top. Now that I know these "rules" I make fewer mistakes than in pr1.0.

@jakiman I agree that the in bed problem is the biggest, so I tend to swipe from the bottom when unsure. I very rarely hold the phone upside down. Even when in bed.