Index: /trunk/admin/themes/default/theme.css
===================================================================
--- /trunk/admin/themes/default/theme.css	(revision 9951)
+++ /trunk/admin/themes/default/theme.css	(revision 10113)
@@ -1044,2 +1044,8 @@
 #batchManagerGlobal #applyFilterBlock {margin-top:20px;}
 #batchManagerGlobal .useFilterCheckbox {display:none}
+
+.warning {
+  background:url(icon/warning.png) no-repeat top left;
+  width: 130px;
+  padding-left: 20px;
+}
Index: /trunk/admin/themes/default/template/plugins_list.tpl
===================================================================
--- /trunk/admin/themes/default/template/plugins_list.tpl	(revision 10100)
+++ /trunk/admin/themes/default/template/plugins_list.tpl	(revision 10113)
@@ -8,4 +8,9 @@
   jQuery('.incompatible').click(function() {
     return confirm(incompatible_msg);
+  });
+  jQuery('.warning').tipTip({
+    'delay' : 0,
+    'fadeIn' : 200,
+    'fadeOut' : 200
   });
 });
@@ -43,5 +48,7 @@
     <table>
       <tr>
-        <td class="pluginBoxNameCell">{$plugin.NAME}</td>
+        <td class="pluginBoxNameCell{if $plugin.INCOMPATIBLE} warning" title="{'WARNING! This plugin does not seem to be compatible with this version of Piwigo.'|@translate|@escape:'html'}{/if}">
+          {$plugin.NAME}
+        </td>
         <td>{$plugin.DESC}</td>
       </tr>