I just installed the plugin on a WP 4.5 website and indeed the autoblock function isn’t working.
I made a small modification in file class-frontend.php of the plugin, lines 197-202:
function ecl_buffer_start() { ob_start(/*"ecl_callback"*/); }
function ecl_buffer_end() {
$contents = ecl_erase(ob_get_contents());
ob_end_clean();
echo $contents;
}
Now it seems to be working.