How to avoid darker color behind a gaussian blur effect?

I have used the effect gaussian blur with black text on top to make a logo.
My problem occures when I try to place the file on a coloured background e.g. a photo and print it. A darker colored area appears behind the gaussian blur. The logo is to be used by others and hence I would like to keep it a vector/illustrator file (not a pixelated photoshop file).
- I have saved it as an ai
- I have all the artwork in one layer
- I have tried object > flatten transparency (but then the area turns white)
- I have tried effect > Document raster effects settings (resolution 1200 dpi / add 35,28 mm around object)

- I use Illustrator CC v. 17.1.0. 64-bit
- the file is cmyk and I only use process colors
- the line is 8 pt and effect is applied with 8 px blur
- everything else in the document is outlines and some text and lines are crossing the blurred object
- color settings: European coated offset ECI
I hope I haven't missed anything. The logo is not launched, but I have enclosed I photo file that is similar and where the same problem occur. The file is placed in InDesign on a blue square and printed from InDesign to a OKIC8660 laser printer.
The light blue to the left is the correct color. The darker blue is not supposed to happen. The yellow is where the gaussian blur is applied.

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Here is a link to a post about the same problem you are having and the same printer. You may find the posts helpful as some were able to find a solution. Post number 6 and number 12 specifically have found solutions that worked for them. Hope this helps some.
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00 00 00 01 52 64 73 20 00 00 00 00 64 6f 75 62 40 00 00 00 00 00 00 00
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@....... == 40 00 00 00 00 00 00 00
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.......@ or 00 00 00 00 00 00 00 40
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How to avoid darker color behind a gaussian blur effect?

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