diff --git a/src/org/openbravo/erpCommon/security/Login_F1.html b/src/org/openbravo/erpCommon/security/Login_F1.html
--- a/src/org/openbravo/erpCommon/security/Login_F1.html
+++ b/src/org/openbravo/erpCommon/security/Login_F1.html
@@ -27,18 +27,20 @@
 <script language="JavaScript" src="../../../../../web/js/utils.js" type="text/javascript"></script>
 <script language="JavaScript" src="../../../../../web/js/windowKeyboard.js" type="text/javascript"></script>
 <script language="JavaScript" type="text/javascript" id="paramDirectory">var baseDirectory = "../../../../../web/";</script>
-<script language="JavaScript" type="text/javascript" id="paramLanguage">	defaultLang = "en_US";</script>
+<script language="JavaScript" type="text/javascript" id="paramLanguage">    defaultLang = "en_US";</script>
+<script language="JavaScript" src="../utility/CheckCleanCache.js?cache=true" type="text/javascript"></script>
+<script language="JavaScript" src="../utility/CheckCleanCache.js?cache=false" type="text/javascript"></script>
 <script language="JavaScript" type="text/javascript">
 
 function validate(action)
 {
-	var frm = document.forms[0];
-	//Se controla que haya rellenado todos los campos
-	if (frm.user.value==null || frm.password.value==null || frm.user.value=="" || frm.password.value=="") {
-		showJSMessage(1);
-		return false;
-	}
-	return true;
+    var frm = document.forms[0];
+    //Se controla que haya rellenado todos los campos
+    if (frm.user.value==null || frm.password.value==null || frm.user.value=="" || frm.password.value=="") {
+        showJSMessage(1);
+        return false;
+    }
+    return true;
 }
 function onloadFunctions() {
 }
@@ -76,7 +78,9 @@
       clearForm();
     } catch (e) {}
     setWindowElementFocus('firstElement');
-    if (!revisionControl('4032')) alert("Your browser's cache has outdated files. Please clean it and reload the page.");
+    if ((!revisionControl('4676')) || (isOpsInstance() != isOpsInstanceCached())) {
+      alert("Your browser's cache has outdated files. Please clean it and reload the page.");
+    }
   }
 
   function onResizeDo() {