If you save the image out or open in Photoshop, are the lines still there? Need to determine if it is a display problem or actually in the image.
I am seeing the same thing in a random test image someone else posted of buildings at night. The discontinuity becomes more apparent if you maximize the sharpening but it is not there in the saved result so appears to be the difference between rendering for the display and rendering for output:
The output TIF does not have it:
yes, unfortunately they stay when the filter is applied.
i'll try to do more testing and see if they stay when saving image directly from ACR, but i need it to apply as a filter, so not really efficient resaving a lot.
And i'll check if full cache makes any difference.
I can see these same issues on my computer but the discontinuity does NOT remain once I open the image in PS or if I save the image out of ACR without going to PS. Are you seeing something different? BTW, upping the sharpening makes the edge more visible for me.