Matinee Animation Standalone Crashes?

So, I’m creating a building animation using a matinee sequence where I’ve animated static meshes using movement and visibility tracks within the matinee. The visibility is being controlled via a Opacity value on the material. The project runs fine in the small editor - I press a button and the matinee plays off that fine. However in standalone it doesn’t even run?? its the same for packaging the project.

It’s all dynamic lighting and I have a basic FPS character set up aswell.

Any ideas???