Index: /CKEditor/branches/features/v4-panel/_source/plugins/floatpanel/plugin.js
===================================================================
--- /CKEditor/branches/features/v4-panel/_source/plugins/floatpanel/plugin.js	(revision 7078)
+++ /CKEditor/branches/features/v4-panel/_source/plugins/floatpanel/plugin.js	(revision 7079)
@@ -88,5 +88,6 @@
 			}
 
-			definition.forceIFrame = definition.forceIFrame || editor.config.panelUseIFrame !== false;
+			if ( editor.config.panelUseIFrame )
+				definition.forceIFrame = true;
 
 			var doc = parentElement.getDocument(),
@@ -474,6 +475,6 @@
  * @name CKEDITOR.config.panelUseIFrame
  * @type Boolean
- * @default true
+ * @default false
  * @example
- * config.panelUseIFrame = false;
+ * config.panelUseIFrame = true;
  */