Help, Drop Shadow filter with strange glares in CS4

Hi,
I've made a symbol for a logo design in Ai CS4 in wich I applyed some Drop Shadows to some elements (white arrows).
The problem is, when I enlarge the symbol (approximately 110 x110 mm), strange glares/"ghosts" appear around the elements that have the Drop Shadow applied to.
There are no Pantones in this, just CMYK colors.
See the image please: http://www.grabup.com/uploads/01773c95e72416002699e3d3e4800428.png
(the strange glares/ghosts are the ones pointed by the red arrows, the Drop Shadow dialog box, corresponds to the red highlighted white arrow on the left with the blue drop shadow.)
When I turn to Outline mode there are no vector paths there, so it only shows this glares/ghosts in normal/preview mode.
This only happens when I enlarge this elements, and the Blur (in the drop shadow) begins to have a large number applied to it (example: blur: 9 mm).whn I Rasterize or Expand Appearance the elements with this drop shadows, the rasterized image maintains the strange glares/ghosts.
The glare/ghosts completely disappear when:
- I reduce the size of the logo/symbol;
- In the Drop Shadow dialog box: Instead of the Color, I choose Darkness (but I need this to have a blue color in shadows not grey/black).
- In the Drop Shadow dialog box: I reduce the size of the Drop Shadow Blur (with 5mm or less of Blur, the glare/ghosts vanish)
Is this a Illustrator bug?
The only solution for this is to reduce the amount of Blur aplyed to the drop shadows elements?
If so, what happens when I have to enlarge this logo to a bigger size, say... an Outdoor?
thank you!
(sorry for my english)

Hi Bob,
Thanks for your reply (very prompt!)
Yes I read that article and thankfully was already exporting using Acrobat 5 (PDF 1.4) so that wasn't an issue.
So now I'm waiting on the printer's reply as I've emailed him a link to that article!
:) Carmel

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"nit_vs" <[email protected]> wrote in
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news:gi854o$qn5$[email protected]..
> Hi,
> I have an HBox with roundedRectangle skin inside a
repeater in a
> vertical
> layout. HBox has drop shadow filter applied on it.
Problem is that, as
> repeater
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> previous Hbox. I want the shadow on the top of next
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