Hi,

click on an icon next to an content object in the admin interface. The context menu pops up. If you choose "Remove", you are redirected to the /content/removeobject page.

kernel/content/removeobject.php

Line 42:
$contentObjectID = $http->sessionVariable( 'ContentObjectID' );

$contentObjectID is always "%objectID", so I guess, there is something wrong in the javascript.

Best wishes,
Georg.