diff --git a/question/behaviour/interactive/behaviour.php b/question/behaviour/interactive/behaviour.php
index ee84f7f09706b..68b83d20f37e2 100644
--- a/question/behaviour/interactive/behaviour.php
+++ b/question/behaviour/interactive/behaviour.php
@@ -71,6 +71,10 @@ public function adjust_display_options(question_display_options $options) {
         // We only need different behaviour in try again states.
         if (!$this->is_try_again_state()) {
             parent::adjust_display_options($options);
+            if ($this->qa->get_state() == question_state::$invalid &&
+                    $options->marks == question_display_options::MARK_AND_MAX) {
+                $options->marks = question_display_options::MAX_ONLY;
+            }
             return;
         }
 
diff --git a/question/type/multianswer/lang/en/qtype_multianswer.php b/question/type/multianswer/lang/en/qtype_multianswer.php
index ddc01555a6a3a..8c6da4196a54b 100644
--- a/question/type/multianswer/lang/en/qtype_multianswer.php
+++ b/question/type/multianswer/lang/en/qtype_multianswer.php
@@ -35,6 +35,7 @@
 $string['layoutvertical'] = 'Vertical column of radio buttons';
 $string['nooptionsforsubquestion'] = 'Unable to get options for question part # {$a->sub} (question->id={$a->id})';
 $string['noquestions'] = 'The Cloze(multianswer) question "<strong>{$a}</strong>" does not contain any question';
+$string['pleaseananswerallparts'] = 'Please answer all parts of the question.';
 $string['pluginname'] = 'Embedded answers (Cloze)';
 $string['pluginname_help'] = 'Embedded answers (Cloze) questions consist of a passage of text with questions such as multiple-choice and short answer embedded within it.';
 $string['pluginname_link'] = 'question/type/multianswer';
diff --git a/question/type/multianswer/question.php b/question/type/multianswer/question.php
index 1d0d817ec1bce..226d84f81b1f7 100644
--- a/question/type/multianswer/question.php
+++ b/question/type/multianswer/question.php
@@ -207,12 +207,10 @@ public function is_same_response(array $prevresponse, array $newresponse) {
     }
 
     public function get_validation_error(array $response) {
-        $errors = array();
-        foreach ($this->subquestions as $i => $subq) {
-            $substep = $this->get_substep(null, $i);
-            $errors[] = $subq->get_validation_error($substep->filter_array($response));
+        if ($this->is_complete_response($response)) {
+            return '';
         }
-        return implode('<br />', $errors);
+        return get_string('pleaseananswerallparts', 'qtype_multianswer');
     }
 
     /**
diff --git a/question/type/multianswer/renderer.php b/question/type/multianswer/renderer.php
index d9f8a8a1da300..932f59bc85922 100644
--- a/question/type/multianswer/renderer.php
+++ b/question/type/multianswer/renderer.php
@@ -55,6 +55,12 @@ public function formulation_and_controls(question_attempt $qa,
                     $qa, 'question', 'questiontext', $question->id);
         }
 
+        if ($qa->get_state() == question_state::$invalid) {
+            $output .= html_writer::nonempty_tag('div',
+                    $question->get_validation_error($qa->get_last_qt_data()),
+                    array('class' => 'validationerror'));
+        }
+
         $this->page->requires->js_init_call('M.qtype_multianswer.init',
                 array('#q' . $qa->get_slot()), false, array(
                     'name'     => 'qtype_multianswer',
diff --git a/question/type/multianswer/tests/walkthrough_test.php b/question/type/multianswer/tests/walkthrough_test.php
index 732631f3f99ad..80e707d0f43e8 100644
--- a/question/type/multianswer/tests/walkthrough_test.php
+++ b/question/type/multianswer/tests/walkthrough_test.php
@@ -67,7 +67,7 @@ public function test_deferred_feedback() {
         $this->check_current_output(
                 $this->get_contains_marked_out_of_summary(),
                 $this->get_does_not_contain_feedback_expectation(),
-                $this->get_does_not_contain_validation_error_expectation()); // TODO, really, it should. See MDL-32049.
+                $this->get_contains_validation_error_expectation());
 
         // Save a partially correct answer.
         $this->process_submission(array('sub1_answer' => '1', 'sub2_answer' => '1',
@@ -207,7 +207,7 @@ public function test_interactive_feedback() {
             new question_hint_with_parts(11, 'This is the first hint.', FORMAT_HTML, false, true),
             new question_hint_with_parts(12, 'This is the second hint.', FORMAT_HTML, true, true),
         );
-        $choices = array('' => '', '0' => 'Califormia', '1' => 'Arizona');
+        $choices = array('' => '', '0' => 'California', '1' => 'Arizona');
 
         $this->start_attempt_at_question($q, 'interactive', 4);
 
@@ -322,6 +322,62 @@ public function test_interactive_feedback() {
                 $this->get_no_hint_visible_expectation());
     }
 
+    public function test_interactive_partial_response_does_not_reveal_answer() {
+
+        // Create a multianswer question.
+        $q = test_question_maker::make_question('multianswer', 'fourmc');
+        $q->hints = array(
+                new question_hint_with_parts(11, 'This is the first hint.', FORMAT_HTML, false, true),
+                new question_hint_with_parts(12, 'This is the second hint.', FORMAT_HTML, true, true),
+        );
+        $choices = array('' => '', '0' => 'California', '1' => 'Arizona');
+
+        $this->start_attempt_at_question($q, 'interactive', 4);
+
+        // Check the initial state.
+        $this->check_current_state(question_state::$todo);
+        $this->check_current_mark(null);
+        $this->assertEquals('interactivecountback',
+                $this->quba->get_question_attempt($this->slot)->get_behaviour_name());
+        $this->check_current_output(
+                $this->get_contains_marked_out_of_summary(),
+                $this->get_contains_select_expectation('sub1_answer', $choices, null, true),
+                $this->get_contains_select_expectation('sub2_answer', $choices, null, true),
+                $this->get_contains_select_expectation('sub3_answer', $choices, null, true),
+                $this->get_contains_select_expectation('sub4_answer', $choices, null, true),
+                $this->get_contains_submit_button_expectation(true),
+                $this->get_does_not_contain_validation_error_expectation(),
+                $this->get_does_not_contain_feedback_expectation(),
+                $this->get_tries_remaining_expectation(3),
+                $this->get_does_not_contain_num_parts_correct(),
+                $this->get_no_hint_visible_expectation());
+
+        // Submit an incomplete response response.
+        $this->process_submission(array('sub1_answer' => '1', 'sub2_answer' => '1', '-submit' => 1));
+
+        // Verify.
+        $this->check_current_state(question_state::$invalid);
+        $this->check_current_mark(null);
+        $this->check_current_output(
+                $this->get_contains_select_expectation('sub1_answer', $choices, 1, true),
+                $this->get_contains_select_expectation('sub2_answer', $choices, 1, true),
+                $this->get_contains_select_expectation('sub3_answer', $choices, null, true),
+                $this->get_contains_select_expectation('sub4_answer', $choices, null, true),
+                $this->get_does_not_contain_num_parts_correct(),
+                $this->get_contains_validation_error_expectation(),
+                $this->get_contains_submit_button_expectation(true),
+                $this->get_does_not_contain_try_again_button_expectation(),
+                $this->get_does_not_contain_correctness_expectation(),
+                $this->get_no_hint_visible_expectation());
+        $this->render();
+        $a = array('mark' => '0.00', 'max' => '1.00');
+        $this->assertNotRegExp('~' . preg_quote(get_string('markoutofmax', 'question', $a), '~') . '~',
+                $this->currentoutput);
+        $a['mark'] = '1.00';
+        $this->assertNotRegExp('~' . preg_quote(get_string('markoutofmax', 'question', $a), '~') . '~',
+                $this->currentoutput);
+    }
+
     public function test_interactivecountback_feedback() {
 
         // Create a multianswer question.
@@ -330,7 +386,7 @@ public function test_interactivecountback_feedback() {
             new question_hint_with_parts(11, 'This is the first hint.', FORMAT_HTML, true, true),
             new question_hint_with_parts(12, 'This is the second hint.', FORMAT_HTML, true, true),
         );
-        $choices = array('' => '', '0' => 'Califormia', '1' => 'Arizona');
+        $choices = array('' => '', '0' => 'California', '1' => 'Arizona');
 
         $this->start_attempt_at_question($q, 'interactive', 12);