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Possible Duplicate:
Bug: Illustrator now refuses to draw lines with stroke weight below 1 pt

On my Illustrator CS5.5 I have the strange behaviour that when I make a perfect horizontal line, the stroke weight has a minimal value of 1pt. I can set it to 0.5pt, but it will jump back.
If I make a non-horizontal line and set its stroke weight to a value <1pt, everything is OK. The moment I make that line horizontal the weight jumps back to 1pt. It is possible though to set the weight to 0pt, however this renders the line invisible.

Is there a setting I can change to avoid this behaviour or is there some special reason for this?

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marked as duplicate by Scott, Yisela, e100, plainclothes, JohnB Dec 22 '12 at 17:46

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Is a duplicate except that I only have this problem with horizontal lines. From the other question it is not clear if it applies to all lines, or just horizontal ones. But I don't think it's enough different for a new question so mine can be closed. – Saaru Lindestøkke Dec 2 '12 at 22:42
It's the same issue and the same solution. – Scott Dec 2 '12 at 22:57
up vote 6 down vote accepted

Uncheck Align to Pixel Grid on the Transform Panel.

This feature was introduced in Creative Suite 5 in order to allow users to make sharper, crisper graphics for screen presentation (web, mobile) by ensuring strokes always fall on exact pixels and therefore reducing the amount of anti-aliasing applied to straight strokes or edges.

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Yeah, this is it. In addition: The default behaviour when creating objects can be set when creating a new document. – Marc Edwards Dec 3 '12 at 9:41

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