BuddyPress.org

Hi guys, im using the latest WP 3.6 + bbPress 2.3.2 + buddypress 1.8

All works fine until you try to either Edit a forum of an existing group (front end) or when creating a new group and then at step 3 adding a forum to this group, when then the page get broken.

The page will remain visible but the header and footer will disappear.

see image below:

I have disabled ALL plugins as well as switched theme to the WordPress / buddypress default one but still the issue remains.

Page end Source code finished without closing this are the last lines:

<form action="http://[domainname]/group1/admin/extras" name="group-settings-form" id="group-settings-form" class="standard-form" method="post" enctype="multipart/form-data" role="main">

Inspect Elements reports error:
Uncaught TypeError: Object [object Object] has no method ‘sortable’

This was also reported on the bbPress forum as im not sure which of the two (i.e .buddypress or bbpress) i should turn to.

Please help.
Dan