I think I had a similar problem but I only got 1 bifrost particle shape being created at origin. Try exporting out all your buildings into a new scene, that might work.

Also check that you are at frame 1. If you create a bifrost container but you've set your scene length to show only..say frame 100-200 - bifrost wont computer properly. you'd need to set bifrost's start time to 100 for it to fill the container.