The Plurk A-Team has updated their internal API, and subsequently broke the unofficial Plurk API created by Ryan Lim. But alas, justice prevails, and we’re able to post to Plurk yet again. Here’s how:

In wp-content/plugins/plurk_updater/RLPlurkAPI/RLPlurkAPI.php, scroll down to/near line 382. There you will find:

$array_query = array(
    'posted' => $posted,
    'qualifier' => $qualifier,
    'content' => $content,
    'lang' => $lang,
    'no_comments' => $no_comments
);

You’ll need to add a single line of code to that file so it looks like the following:

$array_query = array(
    'posted' =>; $posted,
    'qualifier' => $qualifier,
    'content' => $content,
    'lang' => $lang,
    'no_comments' => $no_comments,
    'uid' => $this->uid
);

Voila! It should work now.