Split screen not refreshing(¿color and depth buffer issue?)

Hi i’m developing a 3rd person shooter with split screen multiplayer, and when we implemented the hud with UMG we discovered a really wierd behaviour, if executed in the editor everything worked perfect, but if you used Fullscreen after a few seconds, except the last screen to receive the widget, the other screens stopped refreshing and every frame stairs painted and the new one pains on top.

Playing in the editor

playing in full screen

some more data: this also happens when you generate the .Exe, and while in full screen each time the focus on the screen changes( lose focus, recive focus) it refreshes.

here is a video to the issue:
https://drive.google.com/open?id=0B9JIoBfE_81EUlpEZTVqOWJBQmM

Hello Coke_Abad,

After taking a look at the video provided, it appears as though this is a known issue (UE-29797) and that it has been submitted to the developers for further consideration. I will provide updates with any pertinent information as it becomes available. Thank you for your time and information.

Make it a great day