diff --git a/lib/Alchemy/Phrasea/Core/Version.php b/lib/Alchemy/Phrasea/Core/Version.php
index 96936b449a..ee6054ca28 100644
--- a/lib/Alchemy/Phrasea/Core/Version.php
+++ b/lib/Alchemy/Phrasea/Core/Version.php
@@ -18,7 +18,7 @@ namespace Alchemy\Phrasea\Core;
  */
 class Version
 {
-    protected static $number = '3.8.1-alpha.3';
+    protected static $number = '3.8.1-alpha.4';
     protected static $name = 'Diplodocus';
 
     public static function getNumber()
diff --git a/lib/classes/User/Adapter.php b/lib/classes/User/Adapter.php
index 98b464bfc2..7e28331559 100644
--- a/lib/classes/User/Adapter.php
+++ b/lib/classes/User/Adapter.php
@@ -74,9 +74,9 @@ class User_Adapter implements User_Interface, cache_cacheableInterface
         'images_per_page'         => 20,
         'images_size'             => 120,
         'editing_images_size'     => 134,
-        'editing_top_box'         => '180px',
-        'editing_right_box'       => '400px',
-        'editing_left_box'        => '710px',
+        'editing_top_box'         => 30,
+        'editing_right_box'       => 48,
+        'editing_left_box'        => 33,
         'basket_sort_field'       => 'name',
         'basket_sort_order'       => 'ASC',
         'warning_on_delete_story' => 'true',
diff --git a/lib/classes/patch/381alpha4a.php b/lib/classes/patch/381alpha4a.php
new file mode 100644
index 0000000000..645cb049d3
--- /dev/null
+++ b/lib/classes/patch/381alpha4a.php
@@ -0,0 +1,79 @@
+<?php
+
+/*
+ * This file is part of Phraseanet
+ *
+ * (c) 2005-2012 Alchemy
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+use Alchemy\Phrasea\Application;
+
+class patch_381alpha4a implements patchInterface
+{
+    /** @var string */
+    private $release = '3.8.1-alpha.4';
+
+    /** @var array */
+    private $concern = array(base::APPLICATION_BOX);
+
+    /**
+     * {@inheritdoc}
+     */
+    public function get_release()
+    {
+        return $this->release;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function require_all_upgrades()
+    {
+        return false;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function concern()
+    {
+        return $this->concern;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function apply(base $appbox, Application $app)
+    {
+        $sql = "SELECT usr_id, prop, value FROM usr_settings
+                WHERE prop = 'editing_top_box'
+                  OR prop = 'editing_right_box' OR prop = 'editing_left_box'";
+
+        $stmt = $appbox->get_connection()->prepare($sql);
+        $stmt->execute();
+        $rows = $stmt->fetchAll(\PDO::FETCH_ASSOC);
+        $stmt->closeCursor();
+
+        $sql = 'UPDATE usr_settings SET value = :value WHERE usr_id = :usr_id AND prop = :prop';
+        $stmt = $appbox->get_connection()->prepare($sql);
+
+        foreach ($rows as $row) {
+            $value = $row['value'];
+
+            if ('px' === substr($value, -2)) {
+                $value = substr($value, 0, -2);
+            } elseif ('%' === substr($value, -1)) {
+                $value = substr($value, 0, -1);
+            }
+
+            $stmt->execute(array(':value' => $value, ':usr_id' => $row['usr_id'], ':prop' => $row['prop']));
+        }
+
+        $stmt->closeCursor();
+
+        return true;
+    }
+}
diff --git a/templates/web/prod/actions/edit_default.html.twig b/templates/web/prod/actions/edit_default.html.twig
index c63eba2384..6eb2b714ba 100644
--- a/templates/web/prod/actions/edit_default.html.twig
+++ b/templates/web/prod/actions/edit_default.html.twig
@@ -127,7 +127,7 @@
             <input style="font-size:2px; width:5px;" type="text" id="editFakefocus" />
         </form>
     </div>
-    <div id="EDIT_TOP" style="height:{{app['authentication'].getUser().getPrefs('editing_top_box')}};">
+    <div id="EDIT_TOP" style="height:{{app['authentication'].getUser().getPrefs('editing_top_box')}}%;">
         <div id="EDIT_MENU">
             <div id="EDIT_ZOOMSLIDER" >
             </div>
@@ -150,7 +150,7 @@
 
     <div id='EDIT_MID'>
         <div id='EDIT_MID_L' class='ui-corner-all'>
-            <div id="divS_wrapper" style="width:{{app['authentication'].getUser().getPrefs('editing_right_box')}}">
+            <div id="divS_wrapper" style="width:{{app['authentication'].getUser().getPrefs('editing_right_box')}}%">
                 <div id="divS">
                     {{_self.HTML_fieldlist(recordsRequest, fields)}}
                 </div>
@@ -230,7 +230,7 @@
                 <div id="idExplain" class="PNB"></div>
             </div>
         </div>
-        <div id="EDIT_MID_R" style="width:{{app['authentication'].getUser().getPrefs('editing_left_box')}}">
+        <div id="EDIT_MID_R" style="width:{{app['authentication'].getUser().getPrefs('editing_left_box')}}%;">
             <div style='position:absolute; top:0; left:0; right:0; bottom:0;' class='tabs'>
                 <ul>
                     {% if thesaurus %}
diff --git a/www/skins/prod/jquery.edit.js b/www/skins/prod/jquery.edit.js
index 5f2ac50e0e..ca285f134d 100644
--- a/www/skins/prod/jquery.edit.js
+++ b/www/skins/prod/jquery.edit.js
@@ -1740,7 +1740,7 @@ function startThisEditing(sbas_id, what, regbasprid, ssel) {
         },
         stop: function () {
             hsplit1();
-            setPref('editing_top_box', Math.floor($('#EDIT_TOP').height() * 100 / $('#EDIT_ALL').height()) + '%');
+            setPref('editing_top_box', Math.floor($('#EDIT_TOP').height() * 100 / $('#EDIT_ALL').height()));
             setSizeLimits();
         }
     });
@@ -1753,7 +1753,7 @@ function startThisEditing(sbas_id, what, regbasprid, ssel) {
             setPreviewEdit();
         },
         stop: function () {
-            setPref('editing_right_box', Math.floor($('#divS').width() * 100 / $('#EDIT_MID_L').width()) + '%');
+            setPref('editing_right_box', Math.floor($('#divS').width() * 100 / $('#EDIT_MID_L').width()));
             vsplit1();
             setSizeLimits();
         }
@@ -1769,7 +1769,7 @@ function startThisEditing(sbas_id, what, regbasprid, ssel) {
                 setPreviewEdit();
             },
             stop: function () {
-                setPref('editing_left_box', Math.floor($('#EDIT_MID_R').width() * 100 / $('#EDIT_MID').width()) + '%');
+                setPref('editing_left_box', Math.floor($('#EDIT_MID_R').width() * 100 / $('#EDIT_MID').width()));
                 vsplit2();
                 setSizeLimits();
             }