Retry loading sandbox through button click.

static/js/directives/youtubevideo.js

@@ -106,7 +106,11 @@ define(['require', 'jquery', 'underscore', 'moment', 'text!partials/youtubevideo
 			var initialState = null;
 			var sandboxApi = null;
 
-			var createSandboxApi = function() {
+			var createSandboxApi = function(force) {
+				if (sandboxApi && force) {
+					sandboxApi.destroy();
+					sandboxApi = null;
+				}
 				if (!sandboxApi) {
 					var sandboxFrame = $("#youtubeplayer", $element)[0];
 
@@ -515,6 +519,10 @@ define(['require', 'jquery', 'underscore', 'moment', 'text!partials/youtubevideo
 				}
 			};
 
+			$scope.loadYouTubeAPI = function() {
+				createSandboxApi(true);
+			};
+
 			$scope.showYouTubeVideo = function() {
 				createSandboxApi();
 				$scope.layout.youtubevideo = true;