unity Tank Tutorial in 5.3.1f Screen Darkens after Tank explosion

So, I have seen some workarounds for this problem, but nothing seems quite right. I decided to dig a little deeper - and as far as I can tell, there is something wrong with the TankExplosion asset.

All of the fixes revolved around manipulations in the script - but the asset itself is fundamentally broken. You can see this if you drag it from the Prefabs folder into the Hierarchy and play it... boom... yuck... screen all dark.

So what is wrong? Which part of it is broken?

Well, if I disable the Debris subcomponent in the Inspector (thus hiding it from the editor)... the effect now plays without weird screen darkening. So I suspect the Debris is at the heart of it.

Anyone have a clue? I will keep investigating and post any updates, but I am hoping someone will say: oh duh the "blah blah" is not set correctly.

Thanks in advance.