Post a screenshot of such a green box, provide a link to the thread with the green box, give some more detail (is the same box always green while others are never green? Browsers? Platform? etc.).
Otherwise it's simply impossible to investigate further.
I must of been tred last night, I can highlight and read the text, but used to be able to read the quote, with out having to do anything. I'm not a compuet guy and not sure how to do a screen shot, when I do print preview, the text is legible with no backgroung color. I'm using Win 7/64 at home and work comp.