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why unwanted lines on rasterised vector files ?

namechange11061

23-12-2014

Hi, I am working with illustrator CC 2014 v.17 or 18.1.1 [on iMac OS X v.10.8.5]

Lately I've noticed a couple of horizontal lines on my jpeg files. The original vector files are looking perfect. The lines are 1 pix wide and randomly distributed in gradient or mesh areas.

I updated my illustrator, reinstalled my photoshop - it didn't help.

Can anybody come up with a diagnostic/remedy ?

Thanks for any help.