Yep. Can't close out of ad while it is playing or after it has completed. X is there to close, it just doesn't work, and ad stays on the screen. Even if I hit the 'install now' button I am sent to google play, but the companion app still has the ad on it. Ad won't shut. Have to close down YoWorld Companion and restart.

Today the ad was back crashing the companion app, but the name of the game was different "Game of War: Fire Age". Same game of sliding towers/crops/gold mine, etc onto field, oncoming enemies, and disintegrating wall as time moves on.

Try doing the slot machines.