When using Intervallometer, and bulb timer, on my 50D the camera takes photos until its manually stopped. However, when the above is stopped, all Canon menues gets unstable. "Info view" is total black, and "Image review" is sometimes opening. Red light is continuous.
If power switch is set to "Off", the camera reports that "1 Image Recording", and never shuts off. Its not possible to start a new shooting session after this, and battery needs to be removed.