DFP Unfilled Impressions Flex

Craig V 8 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.