I like the new black backdrop of the board designer, although if I decrease the transparency of my image to better view territories/borders then the black lines of borders fade away into the black backdrop.  Hmmmm, I suppose I could fix this myself by uploading just a white backdrop image so that I can view the borders...perhaps this is fine, although still hitting Submit :P

Hmm good point, will have a think about this one.

When creating map images I have a similar problem when placing new lines over existing ones.
My solution is to use a color that I wouldn't normally have in my image palette.
I usually go with straight RGB Green (00ff00) because it stands out well against most any other color.

Maybe it should just be an option to choose the border color in the Designer.