After updating to the newest 7.x-3.0-beta 1 version of content_lock, the "Cancel Edit" button on any node edit form causes a PHP Fatal error (and returns a 500 server error).
The error message: PHP Fatal error: Call to undefined function _content_lock_node_form_handler_cancel_submit() in /data/virtual/common/drupal/includes/form.inc on line 1520.
A content lock still seems to be placed, and can be removed by viewing the node and using the "release the lock" link, but it seems like a fairly major bug.
Note: this occurs using the latest version of Drupal core (7.54).
3.0
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