you're getting those scibbles in itunes, aren't you? i get them, too. they're not always there for me but they're annoying when they do appear. i'm guessing it's because the interface of itunes is hard-coded and can't be changed by wb. add itunes to the 'do not skin' list in wb and you'll be fine.
oops! i guess i should've read your entire post. it seems you're getting scribbles in other apps besides itunes. (there's a glenn beck joke there but i'm going to be good and not tell it) anyway, i can't help you with the scribbles in other apps. sorry. i don't get them anywhere other than itunes.