Broken on update to WP 3.5 (from much older version)

Immediately after publishing a post:

Warning: in_array() expects parameter 2 to be array, boolean given in /home/madro6/public_html/wp/wp-content/plugins/threewp-activity-monitor/ThreeWP_Activity_Monitor.php on line 1675

Warning: Cannot modify header information – headers already sent by (output started at /home/madro6/public_html/wp/wp-content/plugins/threewp-activity-monitor/ThreeWP_Activity_Monitor.php:1675) in /home/madro6/public_html/wp/wp-includes/pluggable.php on line 876

http://wordpress.org/extend/plugins/threewp-activity-monitor/