Every once in a while, my wallpaper is not stretched correctly over the full desktop even though I've set it up to. Instead, WB7 just centers it. The wallpaper changes every hour, and it's a guess as to what will happen. Is there maybe a size limit? I realize some of the wallpapers are actually quite small in relation to my desktop, but I usually find WB's stretching adequate. Can anyone suggest anything about this issue? I've tried Smart mode and Stretch to get a stretched wallpaper, but it has not helped.

Thanks in advance.