I have recently noticed that the OnLayoutSizeChange triggers when FM Go is moved into the background in iOS. I am wondering if this is a glitch or Intended. I am thinking about using this to detect if the app was recently moved into background. If its not supported I may not use it. I tested the layout size and it doesn't appear to change a value. So I am thinking as a way to differentiate between a rotation and background I would test current layout size vs triggered value. If its the same it was moved to background. I am now also trying to find out when in the triggered script it pauses. If you want to try just put a beep at the beginning of your script that is triggered by the size change.