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I am saving with these settings:

enter image description here

And ending up with weird transparent line artifacts:

enter image description here

The ai file does not have this, and the path has nothing near the place where the lines are showing:

enter image description here

From what I can tell it has to do with rendering the gradient as it appears the line is showing across a color band location, but who knows. How can I prevent this from happening?

UPDATE

I tried saving with a layer underneath it and the same problem occurred, but in a different spot?!?!

enter image description here

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Welcome to GD! Out of curiosity... is AI fully patched and current, and does it happen at smaller sizes? –  Farray Mar 17 '12 at 19:28
    
AI is CS5 and fully up-to-date. It doesn't happen at small sizes at all. –  coneybeare Mar 17 '12 at 19:29
    
Random lines could possibly be bad RAM. I've used SFW with files up to 90 inches and not seen your issue. Are seeing the artifacts in the saved image or just in the SFW preview? –  Scott Mar 17 '12 at 19:59
    
In the saved image unfortunately. And it always is appearing at the same spot. –  coneybeare Mar 17 '12 at 20:24
    
Have you tried simply moving the artwork a bit to adjust it's placement on the artboard? –  Scott Mar 17 '12 at 20:42
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2 Answers

up vote 2 down vote accepted

Open the Illustrator file with Photoshop. Then save for web via Photoshop.

Illustrator's vector to pixel conversion can have very odd hiccups at times. There are cases which have no underlying issue to directly solve and appear more like "gremlins" than bug sor direct issues.

Opening the file in Photoshop allows Photoshop to do the vector to pixel conversion and often results in slightly better results. This is especially true if you're seeing one of these "gremlins" in a piece.

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I was having the same issue, but once I installed an update from Adobe, the problem was resolved. (Or at least I haven't come across it again.)

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