I tried to force load it by modifying the header.php with a:
<script text.... src="http://blabla/wp_content/plugins/infinite-scroll/infinitescroll.init.js.php" />
it then loads but returns an error: //Missing/Invalid PathParse or Signature.
The problem is in the if case at the beginning of the file. In my case, it is the
if($pathInfo = unserialize(base64_decode($_GET['p'])))
that is not fulfilled and I fall in the else case with a error, displaying the message above.
Any idea how I can fix this?