Hey all, I'm not quite sure if this is a bug, or if it is, where to file it, but it took me forever to track down the problem. Here's my test program based on rospy tutorials. (I'm using C-Turtle binaries on 10.04) #!/usr/bin/python import roslib; roslib.load_manifest('crazy') import rospy from std_msgs.msg import String def talker(): pub = rospy.Publisher('chatter', String) rospy.init_node('talker', anonymous=True) str = "hello world" pub.publish(str) if __name__ == '__main__': try: talker() except rospy.ROSInterruptException: pass Fairly standard, and it works like you would expect. However, if you switch the order of 7th and 8th lines, i.e. rospy.init_node('talker', anonymous=True) pub = rospy.Publisher('chatter', String) ...it does NOT publish the message. However, when I add a sleep(1) command after Publisher line, then it works fine. Is this... A) A bug B) A situation where I should just sleep C) A situation where I should publish the message repeatedly until I'm sure it's received. Thanks, -David!!