Pop Up returns even after clicking "Never see this again"

I have received several complaints from people who click "Never see this again" and yet the pop up continues to reappear. They tell me that they are not preventing cookies from being stored on their computer. It is not clear what the problem is as I do not experience it myself; the pop up appears to work as expected.

My configuration settings are here: http://imgur.com/a/nmXyz

I recently updated the plugin to see if this would resolve the issue, but that was not apparent from the release notes. Is this an issue that you have already identified and resolved?