For some reason, many of the global constants are not working in 2.0. For example, adding a questionnaire gives:
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'AND (realm = 'template' OR owner = '2') ORDER BY realm,name' at line 1

SELECT id,name,owner,realm,status,title FROM mdl_questionnaire_survey WHERE status != AND (realm = 'template' OR owner = '2') ORDER BY realm,name
[array ( )]
line 305 of lib\dml\moodle_database.php: dml_read_exception thrown
      * line 558 of lib\dml\mysqli_native_moodle_database.php: call to moodle_database->query_end()
      * line 913 of lib\dml\moodle_database.php: call to mysqli_native_moodle_database->get_records_sql()
      * line 606 of mod\questionnaire\lib.php: call to moodle_database->get_records_select()
      * line 625 of mod\questionnaire\lib.php: call to questionnaire_get_survey_list()
      * line 88 of mod\questionnaire\mod_form.php: call to questionnaire_get_survey_select()
      * line 152 of lib\formslib.php: call to mod_questionnaire_mod_form->definition()
      * line 60 of course\moodleform_mod.php: call to moodleform->moodleform()
      * line 215 of course\modedit.php: call to moodleform_mod->moodleform_mod()

These seem to work if they are changed to 'define' constants, which they should be anyway.