Hi,
I've just notice this situation today, due a report from a collaborator that have access to add items in front end.
When trying 'Add Item' , the popup window give error:

Fatal error: Call to a member function isCheckedOut() on a non-object in /hsphere/local/home/c290983/theazores.pt/administrator/components/com_k2/views/item/view.html.php on line 100!

Everything works fine in the administration, I can add/edit items with no problem.

System:
- Joomla 3.2.3
- K2 2.6.9 (Develper Build) - The problem starts with 2.6.8 version, I've just install de Developer Version to see if this fix this problem.

Appreciate your help, this is URGENT.

Regards and thank you,

Pedro

P.S: File in Attach.

Hi. Just checked under Joomla! 3.2.3 with no issues. Try to get again the development version from getk2.org/assets/get and install it.

Hi Lefteris, thank you for your feedback.
Unfortunately this not solve the problem.
I've read something about some database issues after update to Joomla 3.2.3, related with - Database schema version (in #__schemas): 3.2.3-2014-02-20. I had fix that.
Because the files that we have to change in order to fix are:
administrator/components/com_installer/views/database/view.html.php and
administrator/components/com_installer/views/database/tmpl/default.php, and the file that the system report the error is:
administrator/components/com_k2/views/item/view.html.php on line 100, I think this problem have a direct relation, since the information about the database put me some doughs.

Appreciate if you can help me,

Regards and thank you,

Pedro

SOLVED!!

This is a compatibility problem um DJ Image Slider!
dj-extensions.com/dj-imageslider-download

Just install the K2 Fix Plugin
dj-extensions.com/downloads/cat_view/194-k2-fix-plugin

Regards, thank you and have a nice weekend,

Pedro

You are welcome.