The old App required port forwarding to work when away from home. If the IP address of your Apex changed, then the old App won't work while you are at home either. The IP Address can be found from the network settings screen on the display. You can also use the firmware updater program to find the Apex on your netwok and it's associated IP address. If you are using an iPhone, there is a new App in the iTunes store called Fusion that eliminates the need for Port Forwarding. It's just a simple App version of Fusion that connects to your Fusion account for full Apex control. It's actually pretty slick and works very well. If you have an iPhone, I would suggest you check it out.