Heh... Leave it to me to guess at something, but I think it wasn't necessarily the heightmap image in your earlier attempts that caused the problem - it was the type of compression you used. I'm willing to bet that if you were to zoom in, that your blocky flaws in your earlier posts are 8x8 pixels in size. Why is this? Because you were using a .jpg for your heightmap. These blocks are a characteristic of .jpg compression. JPEG format is great 98% of the time for color images, but in a greyscale used for this application - it's flaws are much more noticable. For use in heightmaps, greyscales saved in .gif (if you need compression) or .bmp (no compression) format are a lot better. Try another project the same way, but with this advice in mind and let me know what the results are. ;) L8R!

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Barbequed Pixels?

Your friendly neighborhood Wings3D nut.
Also feel free to browse my freebies at ShareCG.
There might be something worth downloading.