These horizontal line artifacts appear on screen when zoomed in 1:1 or greater, OK at lesser mags. They are not in the file as it displays correctly in PS at 1:1. This is the first file I have ever encountered this in any version of LR. It is a mild HDR, 3 exposure, one stop apart capture. Anyone else ever see anything similar?
Update: Only occurs when in Develop module and then not all the time. Depends upon an unknown sequence of events to trigger.
What kind of computer and OS do you use? Haven't seen this problem, yet.