landscape upload problem

[swadesmet]

I have downloaded the latest version YoWindow.Have a file with 45 different landscape images and 34 different locations on my YoWindow desktop.Everything was working perfect up till now with adding landscape from collection to different cities.
I have added "Aquilas Spain" and downloaded "Spain 2 yo_spanje2png" to add for that location and all of my 34 cities show skies only now.
Sometimes when I tried to add another image the sky turn into black.The only images still working are the 5 YoWindow images (Sea, airport etc.) but none of the downloaded images anymore. I use Windows 7 home version.What is wrong?