diff --git a/Changes.md b/Changes.md
index 09e956c..a6528f0 100644
--- a/Changes.md
+++ b/Changes.md
@@ -1,3 +1,8 @@
+Change Log in version 402.1.1 (2023092502)
+===========================================
+1. Fix '$OUTPUT is null' - ref: https://moodle.org/mod/forum/discuss.php?d=453194#p1827606.
+2. Fix missing calls to 'user_preference_allow_ajax_update' as in M4.3 they are deprecated.
+
 Change Log in version 402.1.0 (2023092501)
 ===========================================
 1. Add the ability to show the marketing blocks when 'Logged out', 'Logged in' or 'Logged in or out',
diff --git a/classes/output/core_renderer_layout.php b/classes/output/core_renderer_layout.php
index b587b2e..ae9b92d 100644
--- a/classes/output/core_renderer_layout.php
+++ b/classes/output/core_renderer_layout.php
@@ -499,6 +499,9 @@ protected function head($bodyclasses) {
     protected function courseindexheader() {
         global $CFG;
         require_once($CFG->dirroot . '/course/lib.php');
+
+        user_preference_allow_ajax_update('drawer-open-index', PARAM_BOOL);
+
         $left = \theme_adaptable\toolbox::get_setting('blockside');
 
         if (isloggedin()) {
@@ -526,6 +529,8 @@ protected function courseindexheader() {
     }
 
     protected function sidepostheader() {
+        user_preference_allow_ajax_update('drawer-open-block', PARAM_BOOL);
+
         $left = \theme_adaptable\toolbox::get_setting('blockside');
 
         if (isloggedin()) {
@@ -1306,7 +1311,7 @@ public function secure_layout() {
         echo '<div id="region-main-box" class="col-12">';
         echo '<section id="region-main">';
         echo $this->get_course_alerts();
-        echo $OUTPUT->course_content_header();
+        echo $this->course_content_header();
         if (!empty($secondarynavigation)) {
             echo $secondarynavigation;
         }
diff --git a/version.php b/version.php
index 034bd35..0de1d69 100644
--- a/version.php
+++ b/version.php
@@ -33,14 +33,14 @@
 $plugin->component = 'theme_adaptable';
 
 // Adaptable version date (YYYYMMDDrr where rr is the release number).
-$plugin->version = 2023092501;
+$plugin->version = 2023092502;
 
 $plugin->requires = 2023042400.00; // 4.2 (Build: 20230424).
 
 $plugin->supported = [402, 402];
 
 // Adaptable version using SemVer (https://semver.org).
-$plugin->release = '402.1.0';
+$plugin->release = '402.1.1';
 
 // Adaptable maturity (do not use ALPHA or BETA versions in production sites).
 $plugin->maturity = MATURITY_STABLE;