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Good point about automatic login - now the pop ads should not display to non-registered members on forum index page (testing this part to see the effect - UPDATE: effect not acceptable, removed...) and on login/register page, this should enable a paid member to login without ads popping up.
There is not much control over specific ads being displayed by certain ad network. As mentioned above, problematic ads should be reported here:
https://www.popads.net/report-abuse.html . Or make a screenshot and post if here.