diff --git a/IPython/html/static/notebook/js/codecell.js b/IPython/html/static/notebook/js/codecell.js
index 8487357..64f9011 100644
--- a/IPython/html/static/notebook/js/codecell.js
+++ b/IPython/html/static/notebook/js/codecell.js
@@ -304,6 +304,9 @@ var IPython = (function (IPython) {
      */
     CodeCell.prototype.execute = function () {
         this.output_area.clear_output();
+        this.widget_subarea.html('');
+        this.widget_subarea.height('');
+        this.widget_area.height('');
         this.set_input_prompt('*');
         this.element.addClass("running");
         if (this.last_msg_id) {