The image from a connected camera is not displayed on the summary page of the web interface (cP8 and SECP devices). Why?
Check that the camera is connected, enabled, and all your cameras use the same video format (NTSC or PAL). To do this, go to the settings tab, click Camera Settings, and then click Advanced Camera Settings. On the page that is displayed, first press the Check Video System radio button at the top of the page. This will scan the device for connected cameras, which may take a few seconds. Once the system has found your cameras, check the Enable Camera box for all the cameras you would like to enable. You can click the Preview button to display the camera image temporarily in a pop-up window. Please note that all the connected cameras should have the same video format (NTSC or PAL), to ensure the images are displayed correctly.