Index: /FCKeditor/trunk/_whatsnew.html
===================================================================
--- /FCKeditor/trunk/_whatsnew.html	(revision 1466)
+++ /FCKeditor/trunk/_whatsnew.html	(revision 1467)
@@ -74,4 +74,6 @@
 		<li>[<a target="_blank" href="http://dev.fckeditor.net/ticket/1728">#1728</a>] External toolbars
 			are now properly sized in Opera.</li>
+		<li>[<a target="_blank" href="http://dev.fckeditor.net/ticket/1782">#1782</a>] Clicking on radio
+			buttons or checkboxes in the editor in IE will no longer cause lockups in IE.</li>
 	</ul>
 	<p>
Index: /FCKeditor/trunk/editor/_source/internals/fck_ie.js
===================================================================
--- /FCKeditor/trunk/editor/_source/internals/fck_ie.js	(revision 1466)
+++ /FCKeditor/trunk/editor/_source/internals/fck_ie.js	(revision 1467)
@@ -139,4 +139,6 @@
 	// Catch cursor selection changes.
 	this.EditorDocument.attachEvent("onselectionchange", Doc_OnSelectionChange ) ;
+
+	FCKTools.AddEventListener( FCK.EditorDocument, 'mousedown', Doc_OnMouseDown ) ;
 }
 
@@ -431,2 +433,21 @@
 	return aCreatedLinks ;
 }
+
+function _FCK_RemoveDisabledAtt()
+{
+	this.removeAttribute( 'disabled' ) ;
+}
+
+function Doc_OnMouseDown( evt )
+{
+	var e = evt.srcElement ;
+
+	// Radio buttons and checkboxes should not be allowed to be triggered in IE
+	// in editable mode. Otherwise the whole browser window may be locked by
+	// the buttons. (#1782)
+	if ( e.nodeName.IEquals( 'input' ) && e.type.IEquals( ['radio', 'checkbox'] ) && !e.disabled )
+	{
+		e.disabled = true ;
+		FCKTools.SetTimeout( _FCK_RemoveDisabledAtt, 1, e ) ;
+	}
+}