Index: /CKEditor/trunk/_source/plugins/wysiwygarea/plugin.js
===================================================================
--- /CKEditor/trunk/_source/plugins/wysiwygarea/plugin.js	(revision 3639)
+++ /CKEditor/trunk/_source/plugins/wysiwygarea/plugin.js	(revision 3640)
@@ -369,4 +369,22 @@
 									isPendingFocus = false;
 								}
+
+								/*
+								 * IE BUG: IE might have rendered the iframe with invisible contents.
+								 * (#3623). Push some inconsequential CSS style changes to force IE to
+								 * refresh it.
+								 *
+								 * Also, for some unknown reasons, short timeouts (e.g. 100ms) do not
+								 * fix the problem. :(
+								 */
+								if ( CKEDITOR.env.ie )
+								{
+									setTimeout( function()
+										{
+											var $body = editor.document.$.body;
+											$body.runtimeStyle.marginBottom = '0px';
+											$body.runtimeStyle.marginBottom = '';
+										}, 1000 );
+								}
 							},
 							0 );