diff --git a/gen/plone25/mixins/__init__.py b/gen/plone25/mixins/__init__.py
index 535dea5..8afe3ed 100644
--- a/gen/plone25/mixins/__init__.py
+++ b/gen/plone25/mixins/__init__.py
@@ -163,7 +163,10 @@ class AbstractMixin:
            modified values.'''
         # Remove from previousData all values that were not changed
         for fieldName in previousData.keys():
-            if getattr(self, fieldName) == previousData[fieldName][0]:
+            prev = previousData[fieldName][0]
+            curr = getattr(self, fieldName)
+            if (prev == curr) or ((prev == None) and (curr == '')) or \
+               ((prev == '') and (curr == None)):
                 del previousData[fieldName]
         if previousData:
             # Create the event to add in the history
diff --git a/gen/plone25/skin/import.pt b/gen/plone25/skin/import.pt
index 85e493d..7bfffdf 100644
--- a/gen/plone25/skin/import.pt
+++ b/gen/plone25/skin/import.pt
@@ -79,7 +79,7 @@
   </form>
 
   <h1 tal:content="python: tool.translate('import_title')"></h1><br/>
-  <table cellpadding="0" cellspacing="0" class="vertical listing" width="100%">
+  <table cellpadding="0" cellspacing="0" class="listing nosort" width="100%">
     <tr>
       <th tal:repeat="columnHeader python: importElems[0]">
         <img tal:condition="python: repeat['columnHeader'].number() == 1"
@@ -96,9 +96,11 @@
     </tr>
     <tal:row repeat="row python: importElems[1]">
     <tr tal:define="alreadyImported python: tool.isAlreadyImported(contentType, row[0]);
-                    global allAreImported python: allAreImported and alreadyImported"
+                    global allAreImported python: allAreImported and alreadyImported;
+                    odd repeat/row/odd"
         tal:attributes="id python:test(alreadyImported, 'importedElem', 'notImportedElem');
-                        style python:test(alreadyImported, 'display:none', 'display:table-row')">
+                        style python:test(alreadyImported, 'display:none', 'display:table-row');
+                        class python:test(odd, 'even', 'odd')">
       <td tal:repeat="elem python: row[1:]" tal:content="elem">
       </td>
       <td>
diff --git a/gen/plone25/skin/macros.pt b/gen/plone25/skin/macros.pt
index 87e6844..c5429ef 100644
--- a/gen/plone25/skin/macros.pt
+++ b/gen/plone25/skin/macros.pt
@@ -316,8 +316,8 @@
           Display the previous values of the fields whose value were modified in this change.</tal:comment>
         <table class="appyChanges" width="100%">
           <tr>
-            <th tal:content="python: tool.translate('modified_field')"></th>
-            <th tal:content="python: tool.translate('previous_value')"></th>
+            <th align="left" width="30%" tal:content="python: tool.translate('modified_field')"></th>
+            <th align="left" width="70%" tal:content="python: tool.translate('previous_value')"></th>
           </tr>
           <tr tal:repeat="change event/changes/items">
             <td tal:content="python: tool.translate(change[1][1])"></td>
@@ -669,7 +669,7 @@
     </tr></table>
 
     <table tal:define="fieldDescrs python: tool.getResultColumns(objs[0], contentType)"
-         class="vertical listing" width="100%" cellpadding="0" cellspacing="0">
+         class="listing nosort" width="100%" cellpadding="0" cellspacing="0">
     <tal:comment replace="nothing">Every item in fieldDescr is a FieldDescr instance,
       excepted for workflow state (which is not a field): in this case it is simply the
       string "workflowState".</tal:comment>
@@ -723,7 +723,9 @@
     </tr>
 
     <tal:comment replace="nothing">Results</tal:comment>
-    <tr tal:repeat="obj objs" id="query_row">
+    <tal:row repeat="obj objs">
+    <tr id="query_row" tal:define="odd repeat/obj/odd"
+        tal:attributes="class python:test(odd, 'even', 'odd')">
 
       <tal:comment replace="nothing">Mandatory column "Title"/"Name"</tal:comment>
       <td id="field_title"><a
@@ -777,6 +779,7 @@
         </table>
       </td>
     </tr>
+    </tal:row>
     </table>
 
     <tal:comment replace="nothing">Appy (bottom) navigation</tal:comment>
diff --git a/gen/plone25/skin/ref.pt b/gen/plone25/skin/ref.pt
index e6bf1b7..5129be3 100644
--- a/gen/plone25/skin/ref.pt
+++ b/gen/plone25/skin/ref.pt
@@ -178,7 +178,7 @@
         </table>
 
         <tal:comment replace="nothing">Show forward reference(s)</tal:comment>
-        <table tal:attributes="class python:test(innerRef, '', 'vertical listing');
+        <table tal:attributes="class python:test(innerRef, '', 'listing nosort');
                                width python:test(innerRef, '100%', test(appyType['wide'], '100%', ''))"
                align="right" tal:condition="python: not isBack and objs" cellpadding="0" cellspacing="0">
           <tr tal:condition="appyType/showHeaders">
@@ -195,7 +195,9 @@
             </th>
             <th tal:content="python: tool.translate('ref_actions')"></th>
           </tr>
-          <tr tal:repeat="obj objs" valign="top">
+          <tal:row repeat="obj objs">
+          <tr valign="top" tal:define="odd repeat/obj/odd"
+              tal:attributes="class python:test(odd, 'even', 'odd')">
             <tal:comment replace="nothing">Object title, shown here if not specified somewhere
               else in appyType.shownInfo.</tal:comment>
             <td tal:condition="python: 'title' not in appyType['shownInfo']"><metal:showObjectTitle
@@ -233,6 +235,7 @@
               <metal:showObjectActions use-macro="here/skyn/ref/macros/objectActions" />
             </td>
           </tr>
+          </tal:row>
         </table>
 
         </td></tr>
diff --git a/gen/plone25/templates/Styles.css.dtml b/gen/plone25/templates/Styles.css.dtml
index 32ab1e4..d17ea1e 100644
--- a/gen/plone25/templates/Styles.css.dtml
+++ b/gen/plone25/templates/Styles.css.dtml
@@ -2,58 +2,31 @@
 /* <dtml-with base_properties> (do not remove this :) */
 /* <dtml-call "REQUEST.set('portal_url', portal_url())"> (not this either :) */
 
-#portal-breadcrumbs {
-  display: none;
+#portal-breadcrumbs { display: none; }
+#importedElem { color: grey; font-style: italic; }
+
+.appyList { line-height: 1.1em; margin: 0 0 0.5em 1.2em;  padding: 0; }
+.appyBullet { margin: 0; }
+.appyPod { float:right; }
+.appyNav { padding: 0.4em 0 0.4em 0; }
+.appyFocus { color: #900101; }
+.appyTabs { margin-bottom: 1em; }
+.appyTabs li a { border-bottom:1px solid transparent; font-size: 90%; }
+.appyTabs li a:visited { color: #578308; }
+.appyTitle { padding-top: 0.5em; font-size: 110%; }
+.appyLabel { font-weight: bold; padding-right: 0.4em; }
+.appyRefEdit { line-height: 1.5em; }
+
+.appyWorkflow {
+  text-align: center;
+  background-color: &dtml-globalBackgroundColor;;
 }
 
-.appyList {
-  line-height: 1.1em;
-  margin: 0 0 0.5em 1.2em;
-  padding: 0;
-}
-
-.appyBullet {
-  margin: 0;
-}
-
-.appyPod {
-  float:right;
-}
-
-.appyNav {
-  padding: 0.4em 0 0.4em 0;
-}
-
-.appyFocus {
-  color: #900101;
-}
-
-#importedElem {
-  color: grey;
-  font-style: italic;
-}
-
-.appyTabs {
-  margin-bottom: 1em;
-}
-
-.appyTabs li a {
-  border-bottom:1px solid transparent;
-  font-size: 90%;
-}
-
-.appyTabs li a:visited {
-  color: #578308;
-}
-
-.appyTitle {
-  padding-top: 0.5em;
-  font-size: 110%;
-}
-
-.appyLabel {
-  font-weight: bold;
-  padding-right: 0.4em;
+.appyPlusImg {
+  vertical-align: top;
+  position: relative;
+  left: -1.4em;
+  top: -0.55em;
 }
 
 .appyPhase {
@@ -97,7 +70,7 @@
   font-size: 105%;
 }
 
-/* stepxx classes are used for displaying status of a phase or state. */
+/* Following classes are used for displaying status of a phase or state. */
 .stepDone {
   background-color: #cde2a7;
   background-image: url(&dtml-portal_url;/skyn/done.png);
@@ -122,17 +95,6 @@
   background-color: #ffffff;
 }
 
-.appyPlusImg {
-  vertical-align: top;
-  position: relative;
-  left: -1.4em;
-  top: -0.55em;
-}
-
-.appyRefEdit {
-  line-height: 1.5em;
-}
-
 .appyCommonInfo {
   border-color: #ffa500;
   background-color: &dtml-evenRowBackgroundColor;;
@@ -141,24 +103,15 @@
   margin-bottom: 0.5em;
 }
 
-.appyWorkflow {
-  text-align: center;
-  background-color: &dtml-globalBackgroundColor;;
-}
-
-dl.expandedInlineCollapsible dt.collapsibleHeader, dl.expandedBlockCollapsible dt.collapsibleHeader {
-  background:#dee7ec url(treeExpanded.gif) no-repeat scroll 6px 50%;
-  border-width 1px;
-  border-color: #8cacbb;
-  border-style: solid;
-  border-width: thin;
-}
-
 /* With fields layout in columns, standard error frame is too large */
 .error {
   padding: 0.4em;
 }
 
+.odd {
+  background-color: white;
+}
+
 /* Table styles */
 .no-style-table {
   border: 0 !important;