I guess the way you are trying to do that is by going to pictures folder, open Wallpaper subfolder, tap on a pic to open it, swipe from top bezel towards the centre of the screen and tap on the "set as wallpaper" located at the top right corner? If this doesn't work can you do it with a pic that you took using the steps above? If it still doesn't work then back up and wipe.
Originally Posted by macethedon
You can connect you PB to you PC (usb or wifi sharing) and delete the folder that contains the wallpapers. I did it.
Originally Posted by CdaS