This soluctions works for me, you need to add this to functions.php:
/*-----------------------------------------------------------------------------------*/
/** temp fix for thumbnaileditor v. 2.4.4 upload error in page edit uploads **/
/** In order to use PTE with this action removed, you can set a featured image (and then launch the PTE editor from there) or use the standalone media library. **/
/*-----------------------------------------------------------------------------------*/
remove_action('dbx_post_advanced', 'pte_edit_form_hook_redirect');
