i found in wordpress 3.4 engine, there is a bug that could tcp_error on a future,preview,or newest post, i already post the thread here: http://wordpress.org/support/topic/newest-article-cant-appear-but-whole-site-can-appear?replies=3
so, please for developer of this plugin fix that bug, honestly i love this plugin because it helped me much.
FYI: i guess the problem is because the tweet button (API request), because after i deactivated that button but still activate the plugin, everything become normal as usual...