Just wanted to post that I finally sat down and thought about this one and got it resolved.  I have been bugging Neil since testing the 3.1 beta that introduced the ability to select different dreams per monitor to allow Desktop Slideshow to have different images per monitor.  If you set it as each monitor the same image would display on both.   The simple solution to this is to go into your Stardock\Dreams folder in your Documents and copy and paste the dream in place to make a copy of it.  Once you do this, launch DeskScapes and you'll see 2 entries for Desktop Slideshow.  Set one to monitor 1 and the other to 2 and apply and you'll now have different images on each monitor.