Why is my pop-up form not closing when a customer clicks the “X” button?

Dead pop-up close buttons are caused by JavaScript errors that halt the execution of the close event function handler, or when third-party modal apps conflict with local theme scripts.

“The usual culprit is a script error quietly breaking the close function, or two modal apps fighting for control. I’ll track down the conflict and have it closing properly within 24 hours for $99.”
— Jeff Bollettino, Managing Director, Ignite Conversions