UE4 - Crash - Doesn't render scene assets

Hi,
In basic:

Engine crashing on importing an animation (not the issue)
Boot the project back up,
My scene is looking odd.
Turns out half the assets in the level are not rendering, though I click on the asset in the outliner, and it shows there is static mesh and material, yet in the level it is not visible

I have tried removing levels and re-adding them

Opened on their own they look fine, however when used in a persistent level, they are not rendering.
I’ve tried with a new persistent etc

I’ve tried using back up levels from before the crash. Still the same issue.

It almost looks like its rendering some weird alphas…

I’ve unzipped the project from this morning, booted that up, and that looks fine.

Any ideas?

What it should look like…

Knackered rendering

Link to video of it in action - YouTube

Hello,

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Thanks