Not quite sure what the problem is  but the app pretty much does what it wants to do...it never changes my wallpapers when I have it set for which is 12 hrs...I have to wait days for it to change if it changes at all. Then when I try to change my wallpaper manually due to it taking so long  the app still won't let me do it. This used to be a great app now my experience with it just sucks....