I got a report that our calendar isn't working if you try to view an event or go to the next month. I updated the free Spider Calendar Plugin for Wordpress but it's still failing.
We're on Wordpress 4.2.2, and Calendar version 1.4.20
When I click on a detail to pop up a modal window, the Developer console output is this:

http://www.bcpipers.org/wp-admin/admin-ajax.php?action=spidercalendarbig&theme_id=13&calendar_id=1&ev_ids=32&eventID=32&date=2015-06-19&many_sp_calendar=1&cur_page_url=http://www.bcpipers.org/calendar-4/&widget=0 (Not Found)
(anonymous function) @ jquery.js?ver=1.11.2:3
m.fn.extend.domManip @ jquery.js?ver=1.11.2:3
m.fn.extend.append @ jquery.js?ver=1.11.2:3
tb_show @ thickbox.js?ver=3.1-20121105:198
tb_click @ thickbox.js?ver=3.1-20121105:30
(anonymous function) @ (index):346
m.event.dispatch @ jquery.js?ver=1.11.2:3
m.event.add.r.handle @ jquery.js?ver=1.11.2:3

Uncaught TypeError: Cannot read property 'setAttribute' of
nullshowbigcalendar @ (index):264
(anonymous function) @ VM2080:1

Crud, i posted this in Drupal, meant for it to be wordpress. Sorry

Dear user,

We've changed the topic category to WordPress Spider Calendar. Could you please try the solution provided in this forum topic: web-dorado.com/forum/spider-calendar-wor...ound-for-public.html .

If it doesn't help, or you'll have trouble implementing the code, please contact us to [email protected] and give temporary admin access to your website. We will help you out.

Also mention the full link to your forum post in the subject of your e-mail.
Thank you.