Jesus, I just upgraded from Start10 to the full suite mainly for Groupy, but I had the same problem where the windows were ungrouped after restart. Do you understand how this is a fail? I would not have upgraded had I known this. As a media designer, I usually keep 10-20 Explorer windows open, and having them grouped is great, but now I have to regroup them after each restart.
For example, I want to have all of my tutorials in one window. Every time Windows restarts I have to gather them back together again. This is useless. For my work projects I have various resources open for each one. I will have to find a new solution.
Also, an aside - I tried Fences, and it offered to clean up my desktop and I agreed. It took my 20 Explorer windows and shut them all and gave me an empty Explorer fence. I had them open for a reason, it's how I keep up with all of the projects for work and their resources. It's very tough to dig through all of the media and find them again. I love the clean look of Fences, but I need you to understand how much you all inconvenienced me with that decision.