CV-VR 1080 works but 4k doesn’t

Hi,

VR Noob here. I tried rendering with CV-VR’s default Youtube 4k setting (3840*2106) and youtube seems to have difficulty with the video. Video appears distorted and top of the sphere is not wrapped by any texture. Here’s a link.

https://youtu.be/HpWrRsEilZA

I tried rendering with all other settings the same, only changing the output resolution to 1920*1080. Everything seems to be working.

https://youtu.be/LKn0OCbocKs

Any idea what went wrong? Is there a way to fix this?

Thanks.