I believe on the taskbar issue, you was referring to this dark overlay area which do not goes transparent, while the taskbar itself already 100% transparent, yes? If so, that part is in the Raven skin itself. You will need to remove that part via the Skinstudio. Its a Glyph image overlay on the taskbar set by Raven designer.

To remove it you will need to open up Skinstudio 11, open the Raven skin. Go to Edit Startmenu and taskbar area-> Edit Horizontal taskbar-> Background-> Click on Glyph-> This is the image you need to remove. You can do so by click on Code editor tab and remove
GlyphTransMode=3
GlyphImage=The Raven\taskbar_win7GLYPH.tga
GlyphHorzAlign=0
Save skin-> Apply skin.

Thank you,
Basj,
Stardock Community Assistant