Need a little help figuring something out. I've working with about ten sources feeding fifteen monitors around a bingo hall. For budgetary reasons, we're reusing some old Extron equipment (MAV1616 and a MCP 1000) all using base-band/composite video. They have a mix of slightly older RCA flat panels along with some brand new Vizios. Two of my inputs are a close up camera shot of the next bingo ball selected, that switch with a verification graphic (blue screen with white lettering) generated by the bingo machines. This switch is takes place in the machine, prior to going into the Extron matrix. The camera shots look fine, but when it switches to the graphic, the RCAs display it fine, while the Vizios display it for about a half a second and then go black. Switch it back to the camera and they're all fine again. The issue is exactly the same on both bingo machines. All the other inputs work great. I'm stymied. They can return the TVs, but I need to identify the problem and be able to tell them what they need to get. Happy to provide any additional information if you need it.