My Viewport Isn't Showing My 3D Camera Moves

Hi!

My 2D layers are appearing in the viewport fine, but when it comes time to preview a 3D camera move interacting with 3D layers, the camera doesn't move (in the viewport.) The coordinates move (I can see the numbers move), and the 3D layers appear on-screen, but the camera doesn't seem to be rendering. It was working not too long ago and none of my settings have changed, so I'm not sure what's wrong with my After Effects.

Please help if you can!