cannot use the customize and have it show page

Before Wordpress updated itself on me, I was able to go to customize and see the site as I was making changes. Now, I no longer see the page when I click on customize. I went ahead and paid to update to the Catch Responsive Pro 4.0 to see if that would help, and it does not. My table press items no longer appear either. Please help... cannot figure out how to get this to work!!! Thank you, Michelle Parks