A quick little update, the AppBrain library for Basic4Android is updated to version 1.1.
It now has option to always show interstitial ads and is compliant with the manifest editor (B4A V1.8).
Get the latest SDK from AppBrain's site and update to this latest wrapper library.
Also, I've received the payment for March from AppBrain, it has been 2 months now that their payment term is at Net5! Awesomest!