[wp-hackers] Odd wp_insert_post hook behavior MU 2.9.1.1

[Elizabeth Buckwalter]

In my plugin:
----------
public function process_article_submit($action = '') {
    // building up post
    echo "inserting ";
    $sf = wp_insert_post($post);
    echo $sf;
}

public function cache_activity_post($pid, $post) {
    error_log(' uuuuuuh '. print_r($pid, true));
    //....
}
add_action( 'wp_insert_post', array(&$fu, 'cache_activity_post') );


In post.php:
----------
echo '<pre>';print_r($post);echo '</pre>';
do_action('save_post', $post_ID, $post);
do_action('wp_insert_post', $post_ID, $post);

output:
----------
inserting

stdClass Object
(
    [ID] => 931
    [post_author] => 10
    [post_date] => 2010-03-31 17:25:17
    [post_date_gmt] => 0000-00-00 00:00:00
    [post_content] => blah blah blah

    [post_title] => Master Page File

    [post_excerpt] =>
    [post_status] => pending
    [comment_status] => open
    [ping_status] => open
    [post_password] =>
    [post_name] =>
    [to_ping] =>
    [pinged] =>
    [post_modified] => 2010-03-31 17:25:17
    [post_modified_gmt] => 0000-00-00 00:00:00
    [post_content_filtered] =>
    [post_parent] => 0
    [guid] =>
    [menu_order] => 0
    [post_type] => post
    [post_mime_type] =>
    [comment_count] => 0
    [ancestors] => Array
        (
        )

    [filter] => raw
)

931

The post inserts as expected, but the hook does not run.  However, the hook
is run upon delete, and apparently, doesn't pass $post.

error.log
------------
[Wed Mar 31 17:27:44 2010] [error] PHP Warning: Missing argument 2 for
FrontUsers::cache_activity_post() in /path/to/myclass.php on line 454,
referer: http://mydomain.com/wp-admin/edit.php
[Wed Mar 31 17:27:44 2010] [error] uuuuuuh 932, referer:
http://mydomain.com/wp-admin/edit.php
[Wed Mar 31 17:27:44 2010] [error] PHP Warning: Missing argument 2 for
FrontUsers::cache_activity_post() in /path/to/myclass.php on line 454,
referer: http://mydomain.com/wp-admin/edit.php
[Wed Mar 31 17:27:44 2010] [error] uuuuuuh 931, referer:
http://mydomain.com/wp-admin/edit.php
[Wed Mar 31 17:27:44 2010] [error] PHP Warning: Missing argument 2 for
FrontUsers::cache_activity_post() in /path/to/myclass.php on line 454,
referer: http://mydomain.com/wp-admin/edit.php
[Wed Mar 31 17:27:44 2010] [error] uuuuuuh 933, referer:
http://mydomain.com/wp-admin/edit.php
[Wed Mar 31 17:27:44 2010] [error] PHP Warning: Missing argument 2 for
FrontUsers::cache_activity_post() in /path/to/myclass.php on line 454,
referer: http://mydomain.com/wp-admin/edit.php
[Wed Mar 31 17:27:44 2010] [error] uuuuuuh 930, referer:
http://mydomain.com/wp-admin/edit.php


Any help would be appreciated.

Thanks,
Elizabeth Buckwalter