Pop Up Pro is not working on any of the installs on my

Pop Up Pro is not working on any of the installs on my website. It was working a couple of weeks ago, but suddenly stopped. It is not browser specific. I checked this on multiple browsers. It is not the server, we are dedicated. It is not the settings. I tried changing it to "load with footer" instead of "load with ajax" and it still did not work. Do you guys have any suggestions?