Upgraded from cs4 to CC cs6 and now have the same issue with Id and Ai. Not even a good paint brush at that. Haven't tried PS yet, too frustrated. Mine wasn't even a gradient. just a soft color. Looked like I was trying to do a gradient. A bad one at that. My lines were too long for one page so was having to merge two pages. Had to delete the lines entirely and reprint a piece that had be made with cs4 so they would be consistent. Same box and text spanned both pages. choppy printing appeared on the left most edge of both pages, and the second page was actually about 10% smaller than the first. Now today, I can print everything but 11 x 17 in ID.
Dazed and Confuzed.
Does it appear only in print or on screen? Normally if a gradient is used you should add some noise, specially for print to avoid banding. In InDesign you can add it to your feather gradient automatically and save it as a style.
I think this is fairly normal, though the angle may be exaggerating things. You can't add noise to a gradient feather, but you can to a directional feather, though I think you'd be hard-pressed to get the same general appearance.
How does it look in print?
You might have to build the gradient in Photoshop adding noise and place it into ID.
@Charles – are there some color transformations involved in the process?
E.g.: gradient is of type RGB and output is in CMYK?
Then a banding problem will occur in nearly every case.
Even if you are using PhotoShop.
Might be also the case, if you do a CMYK to CMYK transformation…
This gradation has little difference of color change from start to finish, and will be problematic especially in print.
For best print result, create gradation in Photoshop, with these things in mind:
Do not save as jpeg - save as tif or psd.
Create gradation at 100% size - do not resize in any part of workflow.
Resolution really depends on the equipment that will process file for print, you do not want this image to resample. Add noise - to your taste.
If exporting PDF for print - do not use any downsample method + do not use any compression.