Callendar isn't visible after move site to another server

Hi,
I’ve moved my site to another server, different is only PHP version (was 5.3, now is 5.4).
Now I cant’t see callendar, it sholud be here: http://mamawtarnowie.pl/wydarzenia/
Site with implemented callendar:

[gn_button link="http://mamawtarnowie.pl/events/" color="#f5f5f5" size="3" style="1" dark="1" radius="auto" target="self"]Lista wydarzeń[/gn_button]

[fullcalendar]

In apache logfiles all is ok, only GET request, no errors.
Need help with it.

http://wordpress.org/extend/plugins/wp-fullcalendar/