I am having lines appear as I scroll over images in overprint preview. I'm using a MacBook Pro 15" with os Sierra 10.12.6. The document sticks for a minute when I try to scroll, and then makes these glitchy lines on the images at different intervals along where the top of the page had overlapped before. What to do?
Try toggling off the GPU Preview under the View menu.
In that case, it doesn't seem to be a GPU issue.
Do the images look OK if opened in Photoshop?