Well, that's odd. I don't know why you would see that. I've not made any attempt to edit the background color and don't even see that listed as an option.

Perhaps some techie here can share their insights.

[Note: I've converted that post to HTML rather than BB Code. As far as I can tell, this removes the "box" that the quote is placed in and hopefully, will eliminate the green background that you (and perhaps others) may see.]