Index: /CKEditor/trunk/_source/plugins/button/plugin.js
===================================================================
--- /CKEditor/trunk/_source/plugins/button/plugin.js	(revision 6989)
+++ /CKEditor/trunk/_source/plugins/button/plugin.js	(revision 6990)
@@ -90,5 +90,9 @@
 			execute : function()
 			{
-				this.button.click( editor );
+				// IE 6 needs some time before execution (#7922)
+				if ( CKEDITOR.env.ie && CKEDITOR.env.version < 7 )
+					CKEDITOR.tools.setTimeout( function(){ this.button.click( editor ); }, 0, this );
+				else
+					this.button.click( editor );
 			}
 		};