drupal core updated to 7.28

themes/seven/style.css

@@ -475,6 +475,12 @@ table th {
   border-color: #bebfb9;
   padding: 3px 10px;
 }
+/**
+ * Force browsers to calculate the width of a 'select all' TH element.
+ */
+table th.select-all {
+  width: 1px;
+}
 table th.active {
   background: #bdbeb9;
 }