Cool
As for the adverts loading, I've test again, and yes, it's definitely showing the last fully loaded advert:
Load Interstitial Ad Event
Load Reward Video Ad Event
(Interstitial Ad Loading complete)
Show Ad [this shows the Interstitial Ad, as the Reward Video Ad is not fully loaded]
(Reward Video Ad Loading complete)
Load Interstitial Ad Event
Show Ad [this shows the Reward Video Ad, as the second Interstitial Ad is not fully loaded]
(Interstitial Ad Loading complete)
SOLUTION: We need 2 types of "Show Ad" events. One for Interstitial, one for Reward Video Ad.