It might be related to install order.
After updating Start10 to 1.7, I started having issues with the DeskScapes beta. My setup has 3 monitors: 1920x1200, 1440x900, & 1440x900; pre-Start10 update the main monitor (1920x1200) had an animated background and the other two used static images. After updating Start10 to 1.7 and rebooting, the secondary monitors were displaying a still image of the primary monitor's animated background instead of the previously assigned images. Opening "Configure Deskscapes" and attempying to select anything in the application would cause it to become unresponsive.
To troubleshoot I uninstalled Deskscapes (v10 beta 2). After uninstalling Deskscapes and rebooting, I noticed that the Deskscapes folder and it's contents still existing in my program files. By manually purging the Deskscapes directory, rebooting again, reinstalling Deskscapes 10 beta 2, and rebooting again (for safe measure), I was able to use Deskscapes normally again.
Don't know if that helps any but I figured it couldn't hurt to share.