Thanks Pat.
On the terrace, the paved path, the landscape area to the right and the lawn there are white grid lines running through the texture. They shouldn't be there and aren't showing the vectorworks file, but appear when I print the document.
This has happened before and I have no idea why. They disappear when I print the file rasterized. But the text and other aspects of the file don't look good when tick the rasterize option.