change the config.php.ini file in \joomla\mambots\editors\tmedit\popups\ImageManager\ ...
either the entry for $BASE_ROOT or the entry for $BASE_DIR is not correct ...
i had to change the $BASE_DIR because it seems like $_SERVER['DOCUMENT_ROOT']; doesn't really return the correct directory
beforeif your user-directory isn't the same like the $_SERVER['DOCUMENT_ROOT']; you probably also have to change the show_image - function in image.php file (same directory) to make everything working
$BASE_DIR = $_SERVER['DOCUMENT_ROOT'];
$BASE_DIR = "E:/FTP/User/www/test/";
beforegood luck ;)
$img_url = $BASE_URL.$img_path.'/'.$img_file;
$img_url = '/user/test.$BASE_URL.$img_path.'/'.$img_file;