Like the other poster I have found WB6 intermingles windows classic scheme on any but the default skins like aero.  I specifically saw this using Black Vista3.  LBV3 ost most of its unique features and looked like classic skin (grey task bar, menu, etc)

Also side bar skinning did not work for me in any skin.  In Black vista is stayed solid grey, in Aero its transparent which is cool but wont load those SB skins.

tried a full reinstall/reboot etc.....

I am running 64 so perhaps its just bugs or 64 bugs.  Either way its uninstalled and happily back to 5 until its jitters are taken care