first - thanks for the extension!
I've been fiddling around with it and it seems that under Android i get a strange behavior.
The Ad opens and when i close it, the app window itself disappears but the overlay that the app window has does not. Then when i tap a second time it triggers the ad, so the google store or browser opens. When i come back to the app the overlay is gone.
using a Samung Galaxy S2 with 4.1.2.