Apriltag topics do not return any information but execute without errors or warnings
I can launch the apriltag_detector node without errors or warnings but the topics do not return any information. The command 'rostopics list' will show all the correct topics but they do not return any info. After the command 'rostopics echo /tag_detections_pose' nothing happens, the terminal just reacts as it does when it is processing something ad infinitum. If I use web_video_server I can view /image_raw but if I select /tag_detections_image the browser will also continual load but never show anything. The camera was calibrated. I would appreciate any advice in correcting this problem, thank you.
System info:
ROS Kinetic, Ubuntu Mate 16.04 LTS, Raspberry Pi 3, Raspberry Pi camera