Single_proc_gazebo.launch does not subscribe to any topic

[cassini-fly]

Hi all,
Thanks for the useful package you guys prepared. I was trying to run the autorally example and i managed to launch everything so far. However I cannot run the decimation nodlet.
I tried running:
roslaunch imitation_learning_autorally single_proc_gazebo.launch

For some reason, niether left nor right decimator nodlet wants to subscribe to any topic.
Node [/left_decimator]. rostopic info gives me the following:

Publications:

• /left_camera/camera_info [sensor_msgs/CameraInfo]
• /left_camera/cropped_image_color [sensor_msgs/Image]
• /left_camera/cropped_image_color/compressed [sensor_msgs/CompressedImage]
• /left_camera/cropped_image_color/compressed/parameter_descriptions [dynamic_reconfigure/ConfigDescription]
• /left_camera/cropped_image_color/compressed/parameter_updates [dynamic_reconfigure/Config]
• /left_camera/cropped_image_color/compressedDepth [sensor_msgs/CompressedImage]
• /left_camera/cropped_image_color/compressedDepth/parameter_descriptions [dynamic_reconfigure/ConfigDescription]
• /left_camera/cropped_image_color/compressedDepth/parameter_updates [dynamic_reconfigure/Config]
• /left_decimator/parameter_descriptions [dynamic_reconfigure/ConfigDescription]
• /left_decimator/parameter_updates [dynamic_reconfigure/Config]
• /rosout [rosgraph_msgs/Log]

Subscriptions: None

Services:

• /left_camera/cropped_image_color/compressed/set_parameters
• /left_camera/cropped_image_color/compressedDepth/set_parameters
• /left_decimator/get_loggers
• /left_decimator/set_logger_level
• /left_decimator/set_parameters

My configs are:
Ubuntu 16
Gazebo 7.0
ROS Kinetic

Thanks.