On my Win 7, 64-bit Pro, system, DesKScapes 8.10 and earlier does not have this problem - just DS 8.51.
Last week I reinstalled 8.51 to do some other testing and noticed that if DS 8.51 is not configured or has a single image selected AND IS PAUSED, there is no longer a "black screen" issue, for me. It only happens to me when not on pause (randomizing multiple images, or even a single image.)
I do not know if the "black screen" issue happens when using the non-randomizing features of DS 8.51; I have not used those features, since wallpaper randomizing is why I use DS.
Hope this helps.