looks very normal to me. The only error here happens in my browser as well (I think that i didn't assign one material properly)
Lol my debugging made it in aswell!
I think I might now what is happening. I had it happen a couple of times when making the game.
Here is the gist:
In my scene I have a UI panel that has a special material with a special shader (rewinding thingy)
After I added some lights it always turned black and didn't disappear when the rewind was supposed to be over. After adjusting the light parameters (don't cast shadow and so on) everything was back to normal, so I thought that, that's the end of the story. It seems like different systems interpret the code differently for some reason and bring this dead bug back. Basically eveything in the game happens, but you can't see it, since it is hidden behind a black panel.
It's probably the lights that screw with everything. I should try to make a version without lights and see if it works then.