Pixel shift in PDF after flattening

hi,

 

i made post time ago in illustrator forum, it's acrobat issue. here's link. perhaps can picked or moved here admins.

http://forums.adobe.com/thread/1383150?tstart=0

 

thanks.

upon further reading, understand problem called stitching , occurs in areas transparency during flattening. acrobat slices object transparency regions flattens , "stitches" them together. stitching exhibits small shifts (1 or more pixels) or/and overlaps between adjacent regions, resulting in visible glitches.

surprisingly, region has been flattened can further shift if file printed again pdf (with flattening preset).

 

if don't want option of preserving live transparency in pdf (offered acrobat 5.0 , later), how can reduce or perhaps eliminate shifting/overlapping issue?

and why these regions further shift if print pdf again? (supposedly, there no more transparency before second print pdf, can't see why shift again!).

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