I installed a pro3-1616 for a dealer who subbed me to help him out and we were having the same issue with one of the TV's. All the TV's were going thru cat 5 but the one that was giving us issues was the longest run. Atlona had us update the firmware on the matrix and the receiver but that didn't work, they sent us new receiver that did the same thing, then they sent us a different model receiver that did the same thing. We tried different HDMI inputs on the TV with the same issue. The only way we got it to work was when we turned off the TV to make it go to a different input and then when we turned it back on to do back to the correct input