Whatever I try I cannot get an interstitial ad to show when testing my game before uploading to Google Play. I have Admob banners in the game which show up fine on Game over for the 1 player screen and the 2 player screen. I have the interstitial in a couple of old games (pre March 2014) which work great and show up on test. I have added the details in the same way using the new updated Admob i.e. getting the interstitial ID from Admob and adding it to the Admob object's properties in the interstitial box and then in event editor 'Make interstitial request' and then 'Show interstitial'.
Not sure what I am doing wrong. Any thoughts? Should I be adding something else for the new post August 1st Admob?