Whether this is related to your problem or not I can't say but something I have found that something that can cause these sorts of issues is texture size.
I find if the texture image size is something other that 512, 1024, 2048, 4096 then the edges can have something like what your saying.
Especially if the edges are transparent. EG have a ground/sky scene on a plane and make the sky transparent so only the ground displays.
The edge at the top of the sky still shows up sometimes. All depending on how far away from the proper sizes the image is. The further away the worse it looks.
Just something I find that happens to me sometimes when using an image I downloaded from the internet?
i7-3770 3.4GHz CPU 16 GB Ram
GeForce GTX1080 TI 11GB
Windows 10 Pro 64bit
Edited
6 Years Ago by
Delerna