Activation causes PHP error for Admin portal.

I think I got a botched auto-update on the plugin. Every time I activate the plugin I get a PHP Error:

PHP Warning: in_array() [function.in-array]: Wrong datatype for second argument in D:\inetpub\domainid214782\wp-includes\post-template.php on line 1039

If I remove the plugin via phpMyAdmin I can log back into my control panel.

I’ve tried deleting the plugin and installing new, with no better results.

WordPress 3.5.1

http://wordpress.org/extend/plugins/the-events-calendar/