Vanilla 2 "Refresh Comments" Fatal Error

This occurs when I enable the "Refresh Comments" option in the Vanilla 2 "General" forum preferences. I need this feature. It's why I chose to use Vanilla 2.

You can view the error in its entirety here:
http://temp.nanoprobenetwork.org/vanilla2/discussion/getnew/1/2

Undefined index: discussioncontroller_getnew_create
The error occurred on or near: /path/to/my/installation/of/vanilla2/library/core/class.pluginmanager.php
192: */
193: public function CallNewMethod(&$Sender, $ClassName, $MethodName) {
194: $Return = FALSE;
195: $NewMethodName = strtolower($ClassName.'_'.$MethodName.'_Create');
196: $PluginName = $this->_NewMethodCollection[$NewMethodName];
197: if (property_exists($this, $PluginName) === FALSE)
198: $this->$PluginName = new $PluginName($Sender);
199:
200: return $this->$PluginName->$NewMethodName($Sender, $Sender->RequestArgs);

Any ideas?