Lovely pictures.
I am pretty sure Dave changed the size of the banner picture which was what I was looking for and didn't find. He is the one who does the banners so I think he plays around with them for the best effect.
That's why I said Tree mail him for information because anyone can submit a picture for the banners but only Dave or Trish can put them up. I know fot those who aren't good with making banners you can email the original picture to Dave and he will do it.
Give it a try and see what he says.