Ooook looks like the type optimized anti-aliasing was the problem. I'm exporting an artboard with a rectangle filled with the pattern. When I activate the art optimized anti-aliasing the lines disappear. I think this solves it! I have another question. This art optimized anti-aliasing only has an effect on the diagonal pattern. On the pattern I showed you in the original post the art or type anti-aliasing doesn't seem to affect at all. I mean, the other pattern looks just fine with both ant-aliasing. Is this because the diagonal pattern is one of the most difficult to get right as you said before? Thanks a lot!
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