Events do not display using FullCalendar

upgraded to dev ver events manager and to ver 1.2 of wp fullcalendar and still get the calendar corrupted had to reinstall 0.9.1 of wp fullcalendar
with the dev version of events manager I get nothing in the calendar at all but events are in the widgets so downgraded again to ver 5.6
and all working again

I have also upgraded my test site to wp fullcalendar ver 1.2 and events manager to the latest dev version
so after trying everything suggested I am back to a working vesion of the plugins the test site is here and I also use the calendar on other sites too

Any help would be great