OculusMediaSurface on S7 - Texture not updating

I've been using the Note4 for some time with the Oculus Utilities to playback videos with no trouble. I'm now trying to get this to work on a Galaxy S7, but to no avail. The video is playing back - I can hear the audio and my progress bar and controls work. The assigned texture is just not updating.

Here's what I've tried so far:

• Sample scene, straight "out-of-the-box"


• Various texture compression (on target texture): ASTC, ETC, ETC2, Auto Compressed, Auto Truecolor


• Dev build/Profiler/Script debugging: Doesn't show any errors or (extra) warnings


• GLES2, GLES3, and Auto Graphics API


• Unity 5.3.1p2 and 5.4.0b7


• Disabling multithreaded rendering

The video in question plays in MilkVR, and in the stock video player.

The Galaxy S7 that I have has an Exynos 8890/Mali-T880.

I'm hoping this is something trivial that I've forgotten about - has anyone had success on the S7? Perhaps it is Exynos specific?