I upgraded JS from 2.8 to 3.0 (current/latest version).
The output in my the group view and other sections is now corrupt.
I tried myself figuring out what is the reason (went into the template files etc.) and nothing works. I tried to switch form my commercial template to the default JS template and also no change.
This needs to be urgently fixed.

Thank you very much.

Hi Roland.

I'm pretty sure that this's caused by some other extension, and there was also other users with exact problem but unfortunately I can't remember which one was causing this. So I suggest to set your site under maintenance mode, and try to disable all extensions exept of those listed below also try to switch to default Joomla/JomSocial template, in such way you should be able to track this problematic extension. You can also try to download whole page on your hdd and create an copy of it on some dev domain, and there disable all extensions.

Authentication - Joomla!
User - Joomla!
Azrul System Mambot For Joomla
jomsocial facebook connect

I investigated some new plugins and components and figured out that RokBox 2 plugin was the culprit. Actually the plugin works with downward compatibility "disabled". If enabled all that above mess happens. SO, This seems to be solved. I suggest notifying RokBox about this issue since it is a popular extension/plugin. Thank you very much.

Great, then let me close and mark this thread as solved , have a great day! and if you need our further help, please feel free to create a new thread.

Hi Roland,
We have not received any response back from you in over 7 days, and would like to know if you consider this issue to be resolved. If you have any further questions related with this topic, simply reply to this post.
Thanks