It's strange how this bug effects some people. I really don't understand it. maybe it's the new beta release?.. I just recently asked about this as well. Muting and unmuting doesn't work.
This is my steps:
Global boolean:(plays ad every 2 rounds)=true
Start of layout/is interstitial NOT loaded > Create interstitial ad, unmute sound.
On interstitial failed to load > Create interstitial ad
Lives=1/Boolean=true/is interstitial ad loaded > mute sound, Show interstitial ad
How about does anyone know how I can migrate/downgrade to version 197.2? I can't open my file since it's saved on version 198.