I don't know if this is the same thing, but here is what happens to me when I use water. These strange lines appear in the terrain. I got Vue about 6 months ago, and this scene was what I made while doing the tutorial. It is also the reason I just stopped using Vue because I was so disappointed in it! Took 7 minutes to render a picture that is clearly defective. BTW, I just rendered this image after upgrading to Vue 4.1, so that didn't fix it. In my render options I have "final" selected with anti-alias turned ON. If anybody can explain these lines and tell me how to avoid them, I'd give Vue another try, but so far, I consider it a totally useless product.