"Notify Me" breaks in 2.0.8e and bring back the front page IF the product involved has been assigned to a Joomla menu item, "VirtueMart ยป Product Details Layout"
I can hack around by modifying components/com_virtuemart/router.php, line 156, function virtuemartBuildRoute(&$query), switch case 'productdetails', change that line from
if (!count($query)) return $segments;
to
return $segments;
The Notify Me URL in 2.0.8e is
http://<site>/<menu alias>/notify
which is wrong. After the above hack, it is changed to
http://<site>/<menu alias>?layout=notify