Illustrator CS6 questions / Fragen

There have been a number of changes in CS from version5 including the way
colors are translated between Illustrator and Photoshop, appearance, etc.

Without seeing your pattern in it's original form to examine, I would first
check that the hairline tiles disappear when you change the view
magnification. In which case, it is only the screen rendering and will not
actually show in the final file.

If the hairline tiles remain, I recommend re-saving your swatch pattern
without a background color so it can be placed over any background. This
is not only useful for eliminating the tiling effect in most cases but,
also required for use in garment or product comparisons where the
background colors and/or materials will change from project to project.

In the case that you need to use the pattern as a smart object in
Photoshop, you can double-click the smart object icon to re-open in AI and
export as a higher resolution tiff than your PS document setting and
re-size the tiff to replace the smart object file. For example, most print
documents will require 300dpi so saving the pattern as 600 or 1200dpi will
allow you to shrink the pattern 50 or 25% in your PS doc. which should
eliminate any hairlines.

Again, there are different ways to resolve this and welcome any input from
other members. Let us know what works for you!

Mike REEDesign.ch

Thanks for the tip Mike, it does work! Seems to be a good solution.
I-Adobe rocks!