can't view the trajectories

Hi,

Thank you very much for your great work.

I cloned the repo and ran the infer script on your examples. However, when I tried the viewer, I was able to see the point cloud but not the trajectories.
I followed the instructions exactly and toggled the "show trajectories" option.
I tested it on two different computers, and on both, I cloned the repo again.

I would appreciate any help.