Hello Rebecca,
Thanks for writing in! Since your site is not yet live, could you please provide a video screen cast of your site with the issue in it so that we will have an idea of what is going on in your site. Meanwhile, we recommend that you increase your memory allocated to PHP. To increase it, please edit your wp-config.php file and insert these lines:
define( 'WP_MEMORY_LIMIT', '256M' );
define( 'WP_MAX_MEMORY_LIMIT', '512M' );
You can add it before the line
/*That's all, stop editing! Happy Blogging. */
We would loved to know if this has work for you. Thank you.