Index: /CKEditor/trunk/_source/plugins/button/plugin.js
===================================================================
--- /CKEditor/trunk/_source/plugins/button/plugin.js	(revision 6219)
+++ /CKEditor/trunk/_source/plugins/button/plugin.js	(revision 6220)
@@ -110,5 +110,4 @@
 			editor.on( 'mode', function()
 				{
-					this.setState( this.modes[ editor.mode ] ? CKEDITOR.TRISTATE_OFF : CKEDITOR.TRISTATE_DISABLED );
 					var mode = editor.mode;
 					// Restore saved button state.