There could be two explanations for the occurrence of the "Player rendering failed" message on your screen:
- If the video you've uploaded is in 4k resolution, and your screen does not support this resolution, you might encounter this error message.
- Another scenario where this message may appear is when there are 2 or more videos in different zones playing at the same time.
It is highly recommended to add all video contents in same zone for smoother experience. You might see this warning when you try to add videos to more zones in composition creation time.