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DFP Unfilled Impressions Flex

Craig V 4 years ago in BLOX CMS 0

Since we launched Flex, we have been seeing high volume of unfilled impressions. I am sure it is because of the class hidden-xs etc, hiding the ad on a small device and not removing it. Anyway to fix this? I am attempting to switch the class names to use visible-sm etc to see if that makes a difference.