Appointments+ is broken with PHP 5.2.17

I just upgraded my LIVE site to the latest version of Appointments+ and now [app_services description="content" autorefresh=1] doesn't work, it shows up as "Show available times"
and clicking it, doesn't do anything

see here:

http://www.sharedsorrows.com/make-an-appointment/

it works great on my test site that is running PHP 5.4.12

Does it not work with PHP 5.2.17?