Ok, this is pretty much for Neil but feel free to chime in...
There apparently is some form of mask \ shader that sits behind the frames in WB6 I assume to assist in blurring and transparency.. In Vistafying my Sexy Wb skin I noticed.. as you know Neil, a grey outline.. after investigating some (and after fixing the shadows like you suggested) it seems to me that this "mask" is not conforming correctly to differently shaped frames and in particular, frames with more rounded corners.
Im positive my graphics are fine and I'll add that in Wb6 blurring and trans. work just fine.. even with my Vista skin. I am attaching an image showing example of why i feel this is a problem.
Apparently I cannot upload my vista version as Master skin until it is fixed so I thought I would point out what I think is the problem.
Please advise. Thx.
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[/URL] [URL=http://g.imageshack.us/g.php?h=509&i=untitled1kh0.jpg]

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