Is this really true or is it a bug.Is there a limit to how far a message with the message sensor can be sent?If that is the case the blender game engine needs to be improved.
What do you mean how far? As far as I know it can be sent to every object and even across scenes
I was having problems with it in my scene.I thought because i have a big scene and i have a collision senor triggering a message actuator on a cube. Which is transmitting a message to a very distant empty with a message sensor on it that was what stopped it from working.
Messages have no relationship to the geometry of the scene. The message system does not even know such thing exist ;).
Just make sure the recipients of your message exist, are active and listen to the message sensor (with the correct subject).