City Sample Buildings/Roads not spawning

I am rendering videos of the City Sample, but the buildings and ground are not appearing. My camera is set to spawnable. The camera moves like I set it to do in the sequencer. My actors spawn correctly. But the city doesn’t. Cars go flying, people fall into the void.

The only error is Navmesh needs to be rebuilt. Another user tried that, it took two hours and accomplished nothing.

Any ideas of what I can do?

Thanks in advance!

Ok, I just reinstalled the City Sample and now it works as it should.