In Exoclick, I am running a campaign on 5 zones (let's suppose zone names are A, B, C, D AND E). Smart CPM for Zone C is .18.
I have cloned this campaign and tested only Zone C with "CPM" .20. But surprisingly I didn't get traffic for cloned campaign. Why?
Have you been getting traffic from the C zone in the original campaign?
If so, doublecheck the settings to make sure the zone is still "active" in the clone.
Are you also using the same ads in the clone? Some zones do not allow certain ads and offers/funnels, maybe they flagged/categorized the clone in a different way so its blocked from zone C now? Maybe a different person from the review team labeled it in a different way?