Yesterday, when using the PC TV, I pictured an image and tested it to be the wallpaper. So, it worked. I had that image to be my wallpaper. I then changed it to be the image I was using before. So, it worked. I was now having my previous image back as the main image of my desktop.

However, whenever I boot, after the logging, for a few seconds, I see that old image. Then, my image comes right after and appears on the desktop. How can I get rid of that one?