Like RutjeT said, there appears to be an issue with this latest update and using a custom list-widget.php file in your theme. This is unfortunate because it means more dev work in order to benefit from this upgrade. I hope this is not a common issue with updates of this plugin.
EDIT: All I had to do was add the following 2 lines from the new list-widget.php file to my custom list-widget.php file
$events_label_plural = tribe_get_event_label_plural();
$posts = tribe_get_list_widget_events();
for context, here is some surrounding code so you can see where I placed them.
* @package TribeEventsCalendar
*
*/
if ( ! defined( 'ABSPATH' ) ) {
die( '-1' );
}
$events_label_plural = tribe_get_event_label_plural();
$posts = tribe_get_list_widget_events();
//Check if any posts were found
if ( $posts ) {
?>