diff --git a/js/server_privileges.js b/js/server_privileges.js
index a18ec9f4a..5fe839804 100644
--- a/js/server_privileges.js
+++ b/js/server_privileges.js
@@ -212,6 +212,7 @@ $(document).ready(function() {
                 width: 800,
                 // height is a workaround for this Chrome problem:
                 // http://bugs.jqueryui.com/ticket/4671
+                // also it's interesting to be able to scroll this window
                 height: 600,
                 modal: true,
                 buttons: button_options
@@ -322,6 +323,7 @@ $(document).ready(function() {
             .append(data)
             .dialog({
                 width: 900,
+                height: 600,
                 buttons: button_options
             }); //dialog options end
             displayPasswordGenerateButton();
diff --git a/js/sql.js b/js/sql.js
index ac93d6743..2e896ee55 100644
--- a/js/sql.js
+++ b/js/sql.js
@@ -192,12 +192,15 @@ $(document).ready(function() {
     if (! $('#sqlqueryform').find('a').is('#togglequerybox')) {
         $('<a id="togglequerybox"></a>')
         .html(PMA_messages['strHideQueryBox'])
-        .appendTo("#sqlqueryform");
+        .appendTo("#sqlqueryform")
+        // initially hidden because at this point, nothing else
+        // appears under the link
+        .hide();
 
         // Attach the toggling of the query box visibility to a click
         $("#togglequerybox").bind('click', function() {
             var $link = $(this)
-            $link.siblings().slideToggle("medium");
+            $link.siblings().slideToggle("fast");
             if ($link.text() == PMA_messages['strHideQueryBox']) {
                 $link.text(PMA_messages['strShowQueryBox']);
             } else {
@@ -263,6 +266,7 @@ $(document).ready(function() {
                 $('#sqlqueryresults').show();
                 $("#sqlqueryresults").html(data);
                 $("#sqlqueryresults").trigger('appendAnchor');
+                $('#togglequerybox').show();
                 if($("#togglequerybox").siblings(":visible").length > 0) {
                     $("#togglequerybox").trigger('click');
                 }
diff --git a/libraries/common.lib.php b/libraries/common.lib.php
index 95aaae6c9..a4c6a71bb 100644
--- a/libraries/common.lib.php
+++ b/libraries/common.lib.php
@@ -2935,11 +2935,15 @@ function PMA_ajaxResponse($message, $success = true, $extra_data = array())
         $response = array_merge($response, $extra_data);
     }
 
-    // Set the Content-Type header to JSON so that jQuery parses the response correctly
-    if(!isset($GLOBALS['is_header_sent'])) {
-        header('Cache-Control: no-cache');
-        header("Content-Type: application/json");
-    }
+    // Set the Content-Type header to JSON so that jQuery parses the 
+    // response correctly.
+    //
+    // At this point, other headers might have been sent;
+    // even if $GLOBALS['is_header_sent'] is true,
+    // we have to send these additional headers.
+    header('Cache-Control: no-cache');
+    header("Content-Type: application/json");
+
     echo json_encode($response);
     exit;
 }
diff --git a/libraries/header.inc.php b/libraries/header.inc.php
index 1720e80f6..807ec0af2 100644
--- a/libraries/header.inc.php
+++ b/libraries/header.inc.php
@@ -15,7 +15,7 @@ require_once './libraries/common.inc.php';
 
 
 /**
- * If this is an Ajax request, we do not need to generate all this output.
+ * This is not an Ajax request so we need to generate all this output.
  */
 if (isset($GLOBALS['is_ajax_request']) && !$GLOBALS['is_ajax_request']) {