deas0815

I guess we have an issue in the theme.

In functions.php (lifestyle_banner), there is a condition:

if (( 'posts' == get_option( 'show_on_front' )) && (is_day() || is_month() || is_year() || is_tag() || is_category() || is_singular('post' ) || is_home())) {
    lifestyle_get_home_banner();
} elseif(/...

So if we configure the blog (Settings->Reading) to display the latest post on the startpage, you will never see the post thumbnail rendered on a single post page. Unless of course, you directly add it to the content using the editor.

If the former is what you want, just remove || is_singular('post' ). Be aware though, that a theme update will likely reintroduce the issue. Hence, I’d appreciate if the functionality to choose would ship with the next update.

Got my issue fixed. The problem was that W3 Total Cache removed the standard wordpress entries from .htaccess.

As of version 2.5.93, the plugin unconditionally calls:

error_reporting(0);

and

@header("HTTP/1.1 200 OK");

This is very bad behaviour. Honestly, I would not even look at the “pro” version and I’ll get rid of it as soon as possible.