Yes that was it. Thank you for your help!
Hi,
thanks for the advice. I tried to debug, but the only output i got was
Strict Standards: Redefining already defined constructor for class Appointments in /srv/www_sdk/htdocs/wp-content/plugins/appointments/appointments.php on line 43
Strict Standards: Redefining already defined constructor for class AppointmentsGcal in /srv/www_sdk/htdocs/wp-content/plugins/appointments/includes/class.gcal.php on line 26
which i also get with the theme twentyforteen. And this is, as far as i know, not a bug.
The only ting i can think of is, that something with javascript/jquery is not working properly. Or could somehow the stylesheet have something to do with it?
Orthus