Hey, I wasn’t able to get your project to open so I just reassembled your assets and everything in a 4.10 that I knew would build. I’m able to see the swimming lines currently, and will see if there is anything that may reduce it, but I’m not sure how likely it would be since I can easily see it in the Oculus Sample that is included with the installation, which is not using UE4. This is noticeable on the Eye icon when loading the sample pretty evidently.