Index: /CKEditor/trunk/CHANGES.html
===================================================================
--- /CKEditor/trunk/CHANGES.html	(revision 4540)
+++ /CKEditor/trunk/CHANGES.html	(revision 4541)
@@ -79,4 +79,5 @@
 		<li><a href="http://dev.fckeditor.net/ticket/4677">#4677</a> : Fixed 'Tab' key is trapped by hidden dialog elements.</li>
 		<li><a href="http://dev.fckeditor.net/ticket/4073">#4073</a> : Fixed insert template with replace option could result in empty document.</li>
+		<li><a href="http://dev.fckeditor.net/ticket/4455">#4455</a> : Fixed unable to start editing when image inside document not loaded.</li>
 	<h3>
 		CKEditor 3.0.1</h3>
Index: /CKEditor/trunk/_source/plugins/wysiwygarea/plugin.js
===================================================================
--- /CKEditor/trunk/_source/plugins/wysiwygarea/plugin.js	(revision 4540)
+++ /CKEditor/trunk/_source/plugins/wysiwygarea/plugin.js	(revision 4541)
@@ -330,14 +330,9 @@
 					};
 
-					// The script that is appended to the data being loaded. It
-					// enables editing, and makes some
+					// The script that launches the bootstrap logic on 'domReady', so the document
+					// is fully editable even before the editing iframe is fully loaded (#4455).
 					var activationScript =
 						'<script id="cke_actscrpt" type="text/javascript">' +
-							'window.onload = function()' +
-							'{' +
-								// Call the temporary function for the editing
-								// boostrap.
-								'window.parent.CKEDITOR._["contentDomReady' + editor.name + '"]( window );' +
-							'}' +
+							'window.parent.CKEDITOR._["contentDomReady' + editor.name + '"]( window );' +
 						'</script>';