Event Calendar not loading

i have the problem that the event calendar on main event site is not loading since i upgraded to D7.1

the mini calendar is working on all other sites, also on a new d7.1 install it is working on event site,

but not on my site.

i uploaded the complete event folder from download package, also templates, plugins and inc folders i tried.

everytime the same problem only on that site, how can this be?

http://www.ue30-party-portal.de/events/

since hours i looked and now i found it directly after post myself.

i got rewrite rules in .htaccess