@Jautor: He is saying he has Matrix with two cat5 outputs to two baluns to two TVs...the matrix is in the same room as one TV so the cat5 is direct...to get to the other room it goes through a patch panel in a third room. When he uses that configuration with matrix in the first room (reaching the second room via the patch panel), he has a problem. When he reverses it and puts the matrix in the second room (now reaching the first via the patch panel), he has no problem.
@drarthur: Are you using the exact same cables and same spots on the patch panel when you reverse it? Are you keeping the balun with the tv when you reverse it or are you swapping them? I agree that's pretty strange...there's no reason it should matter which direction you go.
If you have matrix in room A and don't connect the other display at all, do you have a problem? If so, try the other balun. If both baluns fail for that TV with no other displays connected, try a different output port on the matrix. You may just have a busted matrix and need to RMA it....or one of the baluns may be bad. Try the various combinations.
If the TV works fine, and it only starts failing when you add the second display, that's equally bizarre. Are they trying to show the same source? IF so, try different sources and see if the problem persists. If so, I'd say again matrix is busted and needs RMA. If it goes away, maybe your source is somehow the cause. Can you show ANY source to both displays at the same time without issue?
It's hard to really say what's going on...if you can provide some of the answers to my various questions, we may be able to say with more certainty what is happening and what you should do. Just try all the possibilities and report what works and what doesn't. Good luck!