Hi,
Thanks for using the Events Calendar.
Here on the pre-sales and translation forum, I’m afraid we do not provide technical support. I would ask that you take any technical support questions across to our wordpress.org forum – our staff scan it periodically and other community members may also be able to help out.
The Events Calendar
Having said that, this might help:
Do you have any custom templates in your theme for the widget?
With 3.10 we had to make some changes and if you do not update those custom templates the Events will not show.
In the list-widget.php template you can add these to the top and that might fix the issue instead having to redo custom work:
$events_label_plural = tribe_get_event_label_plural();
$posts = tribe_get_list_widget_events();
Thanks again!