I am running a Vivotek system with 21 IP cameras on it. It has been in place for about 3 years now. Running the free 7501 software for up to 36 cameras. I have a couple of different series cameras on the system and have had no problem until I tired adding a 8000 series camera to the system. I have connected the camera and did a search for the camera and the system found it. The problem is when I insert the camera to the system all other cameras disconnect and the screen on each camera says it is connecting but non of the cameras come back online until I take the new camera back out of the system. Hope this makes sense and that someone can give some advice Thanks!!