I'm playing around with some sort of smear effect. I have a base image where I pick a small width from and smear that out over another layer which moves around. After a little while that layer starts blinking randomly. I thought about it being the picker that moves out of the to-be-picked image, but that doesn't seem the case.
What is happening here and what can I do to fix this?
This occurs on both an iMac 5K and the latest MacMini.