Your problem is unrelated to the score of 1.0. Obviously with such a score you will not get semi transparency effects, but WB itself should run fine.
That was my presumption as well ... but replies from others indicated that the low score was the problem.
For some reason WB cannot see the skins. Did you alter the installation directory?
Interesting question ... When I first installed WB, I got a popup about the skins being moved to the directory mentioned above -- where they now reside. But no, I didn't alter any directories from their defaults. When I downloaded the WB 7 skins, they got installed to that same new directory.
Another strange thing is that WB "partially" sees the skins, that is, if I click one of the "unknown" entries in the config panel, it will provide the name of the skin with some pulldown options. So, WB does apparently know the skin exists. But yet, it doesn't display anything in the preview part of the config panel, and the menu entries don't work right after I install WB.
One other complication I just thought about. Vista is installed on this machine as well. I'm guessing that what Impulse is doing when I install WB 7 is detecting the WB 6 files in the Vista partition, installing them in Seven, and installing WB 6 to handle those files. Which would be OK if it would then allow me to remove only WB 6 and the related wba directories and files -- but it won't. When I remove WB 6, it removes WB 7 as well.