Strange problem with edit-content filter

[Carlos]

Is the add_action line between <?php ... ?> tags?

This works ok:

Code:

<?php
$thisfile = basename(__FILE__, ".php");
register_plugin($thisfile,'thisisatest','','','','');

add_action('edit-content','show_test');

function show_test() {
echo 'this is a test string this is a test string';
}
?>

(save it as thisisatest.php in your plugins folder)