Pop up! Plugin not working on BP-Social theme site

I installed Pop Up! on two of my sites. One of them is working perfectly, the one installed with the BP Social theme is not working. Could it be a conflict with the theme or maybe another plugin?

You can see what happens to the Pop Up! here: http://spiritualityunites.com/. The pop up comes up but it's empty. I tried putting different information there but nothing seems to work. It seems that it's just not reading the content I put there, no matter what it is.

Thanks for your help!

UPDATE: I just deactivated every single plugin (except Pop Up!) and it still didn't work. Same thing happens. I also tried just simple text in the content area and it's still empty.