Hi @opensesamebuns,
Thanks for reaching out to us.
We actually password protect WordPress the_content hook. So by default, the excerpt is protected as well. We will develop a new feature that allows showing the post excerpt even if it’s password protected in our upcoming version.
The featured image is not a part of the_content though. So it’s actually not protected and should show up on your blog post.
It could a theme display issue. You may want to double-check your theme setup or drop us an email to hello(at)preventdirectaccess.com with some sample URLs and screenshots so that we can take a look at it for you.