Thank you for responding so quickly.
I do have that option set as you’ve specified (you can see the setting below). The appearance on page load is just a flicker, not the usual “when page loads” presentation. It might not even be noticed on a T1 connection, but on my internet connection it is very obvious. I’ve seen this with other modals/popups too.
Modal Window Settings:
Show a modal window:
Click on a link (with id)
Add an id=’wow-modal-id-X’ to the link, where X is the number of the modal window