You have helped me with this issue once but it is reoccurring. The Pop Up plugin is not loading. It was working fine until I checked the box to use java script to size and center the pop up (3rd option).
After I check that option the plugin no longer works, even if I uncheck that option the plugin no longer works. Another issue is that when I use Java script to size the pop up (1st option) the right margin is 0px.