diff --git a/openide.loaders/src/org/openide/text/DataEditorSupport.java b/openide.loaders/src/org/openide/text/DataEditorSupport.java
--- a/openide.loaders/src/org/openide/text/DataEditorSupport.java
+++ b/openide.loaders/src/org/openide/text/DataEditorSupport.java
@@ -121,12 +121,16 @@
 public class DataEditorSupport extends CloneableEditorSupport {
     /** error manager for CloneableEditorSupport logging and error reporting */
     static final Logger ERR = Logger.getLogger("org.openide.text.DataEditorSupport"); // NOI18N
+    private static final RequestProcessor RP = new RequestProcessor(DataEditorSupport.class);
 
     /** Which data object we are associated with */
     private final DataObject obj;
     /** listener to associated node's events */
     private NodeListener nodeL;
 
+    private volatile boolean fileWritable = true;
+    private volatile boolean checkFileWritable = true;
+
     /** Editor support for a given data object. The file is taken from the
     * data object and is updated if the object moves or renames itself.
     * @param obj object to work with
@@ -327,9 +331,39 @@
             }
         }
 
-        return annotateName(name, true, isModified(), !obj.getPrimaryFile().canWrite());
+        String res = annotateName(name, true, isModified(), fileWritable);
+        if (checkFileWritable) {
+            checkWritableLater();
+        } else {
+            checkFileWritable = true; // Just computed, check it the next time.
+        }
+        return res;
     }
-        
+
+    /**
+     * Check that correct "writable" status was used. If not, fix the status and
+     * update the titles. See bug 227452.
+     */
+    private void checkWritableLater() {
+        RP.post(new Runnable() {
+            @Override
+            public void run() {
+                boolean newValue = !obj.getPrimaryFile().canWrite();
+                if (fileWritable != newValue) {
+                    fileWritable = newValue;
+                    checkFileWritable = false;
+                    EventQueue.invokeLater(new Runnable() {
+
+                        @Override
+                        public void run() {
+                            callUpdateTitles();
+                        }
+                    });
+                }
+            }
+        });
+    }
+
     @Override
     protected String documentID() {
         if (! obj.isValid()) {