There are absolutely no fatal JS errors coming from CB Activity. CB Activity jQuery also appears entirely functional. Your page however has other things failing. See the below.
Here is an exact copy with rocketscript disabled: testmunich.international-friends.net/index.php/events
IN: /cometchat/cometchatjs.php
ON: Line 225
ERROR:
Code:
Uncaught TypeError: Cannot read property 'scrollBars' of undefined
And finally here is a the live and buzzing one that does not work: munich.international-friends.net/index.php/events
In addition to the above this page also has the below.
IN: inline-d5017a95e0.js
ON: Line 3
ERROR:
Code:
Uncaught TypeError: jQuery(...).mobileMenu is not a function
None of these are coming from CB Activity. Both of the above are also failing to load the below file.
/includes/js/joomla.javascript.js
Switch to default Joomla template and see if issue persists. Only way this could happen is a jQuery conflict due to the above usages not using either Joomla API or a proper namespaced loading behavior, which would fail on any CB page that loads jQuery and regardless of CB Activity version.
You also have a warning directly from rocket loader below.
IN: rocket.js
ON: Line 4
Code:
Modernizr 1.6ish: miniModernizr for Isotope detected. This version is known to cause issues with async JavaScript loaders. Please upgrade to at least 2.6: http://modernizr.com/
If headers are being forced to async load it will break load orders as well as none of those headers are designed for async behavior, which could also be the issue (CB Activity jQuery forced to async when it shouldn't).