After upgrade my Zenfone2 to android 6.0 some UMG images (with alpha channel) now shows 1 pixel lines around buttons or image on device. On editor everything looks fine. This lines blinks very fast and sometimes shows on all sides of the image (see below). This happens in my game and with Unreal Match 3 demo too.
Does anybody knows how to remove this lines? This happens in versions 4.12 and 4.13.
Yes, it’s a known issue with PowerVR based devices, mostly noticeable on iOS since all iOS devices use PowerVR.
There are currently two workarounds: first as you found out is to not use mips on textures with alpha channel, and second is to turn on “Preserve Border” option, that way you can keep mips.
