This is a lifesaver, you have no idea. I tried printing in B&W but the color backgrounds made everything blurry, now I can actually print it. Thank you!
Since I have you here, another question. If you paint a river or a barrier, how can you erase it? Other than undoing it, I don't see how.
Painting and unpainting barriers/rivers work the same way. Select an edge while in barrier/river mode and it will add a barrier/river. Select the same edge again to remove the barrier/river.
If that doesn't work let me know. There could be a bug of some kind.