How do I fix this weird overlay that sometimes appears randomly?

Here is a picture. http://imgur.com/gallery/IQYk3dU

I dont know how they are setup but I think its layer/group. The middle screen is a different input then the two side screens, the two side screens always show the same thing.

Resolume on a mac at the church I work at has a problem where when it outputs to the 3 outputs (2 projectors and a LED wall) sometimes it will do a puzzle pattern overlay over the current picture. It will only go away after we restart the program. Can anyone help?