Due to the problems with W3 total cache, we switched to wp super cache. Since then, AEC has stopped functioning properly. In the popup, only a white screen shows. There is html in there, and fields are set but they have no content (and therefore don't show up?).
Any clue? On our staging environment it is functioning without problems, but there WP super cache is not isntalled (and the .htacces is not changed).