I recently updated from Laytheme 2.5.7 to 2.5.8. After the update, all of the content on my site disappeared. Fortunately, it's just a one-page place holder.
I checked the post name and it is correct and I do not see a .htaccess message.
I checked the source code and the html is correct but it's not rendering.
I viewed on Safari 11.1.2 and Chrome 67.0.3396.99 on a 15" MacBook Pro using OS 10.13.6.