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is the text/image too small?
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12pt type. Never a problem before...
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Its most likely occuring in the raster process. You should probably not underline it, but draw a separate rule.
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Not much of a &quot;feature&quot; then, is it? Hmmm... I just can't help wondering why it used to work and now it doesn't...
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All fonts, sizes and weights appear to have the same problem. Pretty frustrating when you have to mock up a bunch of web links...
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Have you tried converting the type to outlines before it is rasterized in the saving process? Choose Type&gt; Create Outlines, this will convert your typeface to vector paths. 
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Check the rasterization settings, specially resolution and antialiasing.<br />
Jose
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I can't find any settings that make a difference. Although suddenly, NEW files are rendering the underline properly. Nothing obvious has changed. The older files all still have the same problem.
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Recently upgraded to Illustrator CS3 (13.0.2, on PC). If I underline text, it looks fine on screen - but If I export the graphic as a gif or jpeg, the underline becomes dashed. It appears dashed in both the preview within Illustrator and in the final graphic file, when viewed outside of Illustrator. Has anyone else had this problem?
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Recently upgraded to Illustrator CS3 (13.0.2, on PC). If I underline text, it looks fine on screen - but If I export the graphic as a gif or jpeg, the underline becomes dashed. It appears dashed in both the preview within Illustrator and in the final graphic file, when viewed outside of Illustrator. Has anyone else had this problem?

Its most likely occuring in the raster process. You should probably not underline it, but draw a separate rule.

Not much of a &quot;feature&quot; then, is it? Hmmm... I just can&#39;t help wondering why it used to work and now it doesn&#39;t...

All fonts, sizes and weights appear to have the same problem. Pretty frustrating when you have to mock up a bunch of web links...

Have you tried converting the type to outlines before it is rasterized in the saving process? Choose Type&gt; Create Outlines, this will convert your typeface to vector paths. 

Check the rasterization settings, specially resolution and antialiasing.
Jose

I can&#39;t find any settings that make a difference. Although suddenly, NEW files are rendering the underline properly. Nothing obvious has changed. The older files all still have the same problem.

Illustrator - text underlines appear dashed in exported graphics

Illustration software is distinguished from photo-editing software in that the result is an original construction, rather than the manipulation of a photograph. Illustration software uses vector-based tools such that the content is stored digitally as resolution-independent mathematical formulae describing lines (open paths), shapes (closed paths), and color fills, strokes or gradients. Vector paths are constructed of anchor points and path segments. Illustration tools typically create precise lines, shapes and patterns with well-defined edges and are superb for working with complex constructions such as maps and typography.

Illustration Software

Websites use graphics to enhance information, assist navigation, and generally improve the user’s experience. To create those graphics, developers use any number of programs, like the Adobe Creative Suite (Photoshop and Flash have their own topics), the CorelDraw suite, Xara, Gimp, ACDSee, Serif, ULead and others.