Hi Javier!
Encountered something of the sort at our site www.vidyaweb.com
You can edit any post at any time (though not recommended), if you are an administrator by adding this line in your config.php.
$CFG->admineditalways = true;
Take care you add it in config.php before the the line containing:
require_once("$CFG->dirroot/lib/setup.php");
Happy hacking!
Forum
Administator editing students posts?
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