Beta releases with support for the Windows 8.1 Preview are now available for Fences (v2.11) and ModernMix (v1.09) for registered users and ODNT customers.
The betas can be downloaded via the store accounts page (https://store.stardock.com/myaccount/products/) or Stardock Central (if Show betas is enabled).
Fences addresses a drag and drop issue with icons on the desktop with Windows 8.1, as well as a similar (but unrelated) issue for some customers who are also running Stardock's DeskScapes product.
ModernMix adds support for the Windows 8.1 Preview.