Index: /FCKeditor/trunk/editor/_source/classes/fckdomrange_ie.js
===================================================================
--- /FCKeditor/trunk/editor/_source/classes/fckdomrange_ie.js	(revision 621)
+++ /FCKeditor/trunk/editor/_source/classes/fckdomrange_ie.js	(revision 622)
@@ -135,6 +135,21 @@
 FCKDomRange.prototype._GetSelectionMarkerTag = function( toStart )
 {
+	var doc = this.Window.document
+	var selection = doc.selection ;
+
 	// Get a range for the start boundary.
-	var oRange = this.Window.document.selection.createRange() ;
+	var oRange ;
+
+	// IE may throw an "unspecified error" on some cases (it happened when
+	// loading _samples/default.html), so try/catch.
+	try
+	{
+		oRange = selection.createRange() ;
+	}
+	catch (e)
+	{
+		return null ;
+	}
+
 	oRange.collapse( toStart === true ) ;
 
@@ -142,5 +157,5 @@
 	// This is known to happen when the editor window has not been selected before (See #933).
 	// We need to avoid that.
-	if (oRange.parentElement().document != this.Window.document)
+	if ( oRange.parentElement().document != doc )
 		return null;
 
@@ -148,5 +163,5 @@
 	var sMarkerId = 'fck_dom_range_temp_' + (new Date()).valueOf() + '_' + Math.floor(Math.random()*1000) ;
 	oRange.pasteHTML( '<span id="' + sMarkerId + '"></span>' ) ;
-	return this.Window.document.getElementById( sMarkerId ) ;
+	return doc.getElementById( sMarkerId ) ;
 }