I took the plunge and installed the new beta on my laptop - love the ability to have windows clients just show up on the desktop. I have always had the option "Show window contents while dragging" disabled for performance reasons and because I prefer to just see the outline rectangle. I noted that in this mode, if I drag a Windows client around, during the drag you can see the Windows desktop inside the outline rectangle. Not clear there's anything that can be done about it but since most people leave this option enabled, I wasn't sure if this was a known issue. D
Hmm, I noticed the same issue. I guess it's the way Windows does when dragging without showing Windows content.