Issue with Password Protect Plugin

Yesterday, I purchased Password Protect. I immediately installed it and used it to create protection for the recipes on my site such as this one:

After updating the post, I was able to go to the page, put in the password:


and immediately get access to the recipe! It was FANTASTIC and just what I was looking for in order to eliminate the complication of WishList Member on my site.

Today, the password box still appears and it is protecting the content, but for some reason, putting the password in does NOT show the protected content.

Nothing at all has changed on my site since the installation and seeing it working last night. What else can I look at to fix this issue?