Background colour of a new stack

[Graham Samuel]

This may be old news to some, but in the LC7x series and earlier, if you created a stack, the card displayed as white. In LC 8.1.1, it displays as grey (reported as 220,220,220). To make cards look the way they did in earlier versions, I have to created a background rectangle graphic specifically coloured white. 

Was this a deliberate change? Or have I  made some odd mistake? Looks like I need to tweak some cards.

Graham