ah, problem is solved. now it´s working. we had to enter the complete wordpress version into define(‘QT_SUPPORTED_WP_VERSION’, ‘3.6.1’)
We changed the parameter in the qtranslate.php but we still have the
advice , that the qtranslate editor is not ok for the wordpress version.
wordpress version : 3.6.1
qtranslate version : 2.5.36