Why don't shortcodes work in WP 3.7.1?

Question

WordPress

No matter what I did, the shortcode is not accepted by my template. The basis of the site is the twentyeleven template.
I insert the shortcode in the html editor, refresh the page and nothing happens. Code - text.
Is it not working somewhere in the template? All latest version.

Answer 1

To see all active shortcodes, you can use the code:

<?php
global $shortcode_tags;
echo "<pre>";
print_r($shortcode_tags);
echo "</pre>";
?>

this way you will at least know if your shortcode is registered or not.

Answer 2

Apparently there is an error somewhere :) Is the
function even called? Maybe you made a mistake somewhere? Activate the WP_DEBUG option, maybe the notifications will say something

Answer 3

debug didn't show anything.
and I thought to activate shortcodes it is enough to install a plugin :) isn't it?