Yeah, thanks the Edge Fade effect on the fields sheet (and on Terrain), doesn't really work with the back and white. Try disabling (unchecking) the box on the sheet & effects dialog.

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Hi there! I can confirm it's the same for me... looks like something broke with Contoursm. We'll investigate.

Joe Slayton tells me that it is a problem with the rendering of a bitmap-filled line, when it gets so zoomed out that the line gets very thin in display (that's why it's zoom dependent and doesn't show up on export).

You can just ignore it during work if you like, or change the fill-style to solid and an appropriate color like in the attached vers

ion.