I have a clue to give about that shutdown text.
When I make a skin, I usually create a new font in SKS, and turn down the alpha to make it invisible, and use that when I don't want the text to show there. When Jim tested my latest skin, he told me about the text showing in Windows8. I had to get creative to get rid of it. 
I ave not upgraded yet to the new versions of WB and SKS.
So it seems like you have to skin the Vista buttons and not the Win7 normal button to keep the text invisible in Windows8. That could be a problem with where WB, or Start8 gets the text for that button.... not sure.