CB Groupjive-events: error notice when using content plugin

Hi,
I know you remake gj. But I am using it now

I had to use a content plugin (its us is enabled) but when saving I get:
"You don't have permission to access /index.php/cb-profile/pluginclass on this server."
What can I do?

When saving what? Content plugins are not fired/parsed on save, but only on display. Based off the error it sounds like you're trying to use an extension that is not designed for your version of Joomla. For example a J1.x extension on J3.x can cause that due to the direct access check at the top of the file.

thanks but:

PHP erstellt für Linux server46.hostfactory.ch 3.2.0-4-amd64 #1 SMP Debian 3.2.65-1+deb7u1 x86_64
Datenbankversion 5.5.40-0+wheezy1
Datenbankzeichensatz utf8_general_ci
PHP-Version 5.4.36-0+deb7u3
Webserver Apache
PHP-Interface für den Webserver cgi-fcgi
Joomla!-Version Joomla! 3.4.0 Stable [ Ember ] 24-February-2015 23:00 GMT
Joomla!-Plattform-Version Joomla Platform 13.1.0 Stable [ Curiosity ] 24-Apr-2013 00:00 GMT
Browsererkennung Mozilla/5.0 (Windows NT 6.1; WOW64; rv:35.0) Gecko/20100101 Firefox/35.0

this is a clean install of joomla 3.4! and only cb2.0, gj 2.7 and groupjiveevents are installed and activated
I have inside a gj category a gj group.
I choose new event and fill in the date, time, address. And in the textfield I insert with the official xtd-button image an image from inside joomla.
After I save, clicking the button. Then I get the mentionned error notice.

when I do the same inside of a new cb blog, I don't get this problem and the blogpost is saved.
EDIT: it's the same with the gj events patch

It's probably bugged, but I can't say for sure as I'm on a half-developed GJ 2.8.0 build where it's working fine. I can't see any reason for it as there is nothing in the save code to parse content plugins or anything of the sort; it's all done on display. Only reason for it to fail is if the jQuery fired on save isn't working right for the editor. Press F12 and view the browser console to see if any fatal errors come up when clicking the Schedule Event button.