same problem here..
the “?” is important, if you don’t use pretty links in your permalink section.
but you do use pretty links, so open statpress.php and have a look at line 571 and get rid of the .”/?”. so change the line from
[…] href='”.get_bloginfo(‘url’).”/?”.$rk->urlrequested.” […]
to
[…] href='”.get_bloginfo(‘url’).$rk->urlrequested.” […]
do it the same way in line 580, 715.
notice, i’m using version: 1.2.9.2 of the plugin.
best, mike