Please try the following after a fresh reboot:
voxl-inspect-cam tracking_down tracking_front tracking_rear tof_ir hires_small_color
Running voxl-inspect-cam -a can break the camera server because there are too many output streams to process. This used to be a good option in the past for a quick test, but with 5 cameras and ~25 streams this is becoming too heavy. In normal use cases, only one stream is used from each camera.
If you are just getting started, I would suggest updating your drone to at least SDK 1.5 or even 1.6, however you should still be able to get camera streams displayed in voxl-portal or using the limited voxl-inspect-cam command.
If you still cannot get this to work, please do the following to stop the background service for voxl-camera-server and run in in the foreground and past the output:
#stop the background service (it will restart after reboot) systemctl stop voxl-camera-server #run camera server in foreground voxl-camera-serverAlex