I've been using the front camera / NAV-TV combination for a long time now. It is especially useful when pulling up to a pole or wall when parking. Without any changes or incidents, the camera simply stopped working. I try the NAV-TV method and the standard Ford methods, but it simply goes to the "how to activate camera" screen, i.e. "disabled". The NAV-TV is still working with the reverse camera. I tried re-seating the connector at the camera, but that did not help. Beyond that, I'm not sure how to diagnose the problem. Do the cameras occasionally die unexpected or am I looking at a connection issue? I'm still under extended warranty, but I'm not sure how Ford service would react with the NAV-TV installed. Any ideas on how to further diagnose the problem? I was going to simply buy one off of EBay to try, but dang they are expensive.