Hello, according to your suggestion I installed the Dev version. As a matter of fact, I installed it on a fresh install of the template quickstart, copying all K2 items via phpmyadmin etc. So we are talking about a semi-fresh installation

Everything seems to be working Ok, except that at the backend, when I try to edit a K2 item or category, the title field is empty and impossible to edit. The title itself is there, it shows both on frontend and backend list view but when trying to edit item/category, it's disabled and looks empty.

I think you should as the template developer about this issue.
The most probable explanation is that a plugin that came bundled with the template is causing this.

It was working fine with the latest stable version of K2.

Also, saving any changes to the K2 parameters is still throwing a blank screen. All other configurations (Global or other components) save OK.

I am checking with the template developer and getting back to you on this.

Needless to say that K2 seems more buggy than ever. I have been using it for ages, almost since day one and I was also quite happy that it is a Greek origin product but its recent issues it makes me think twice about continuing to use it. Just saying...

FYI, I rolled back to 2.6.8 and now the title field is working as expected.

Parameters are still not saved.

If other extensions are not compatible with the latest version of K2, sadly we cannot do anything about this.

Keep in mind that template providers use frameworks which are compatible with only certain versions of K2.

But we are talking about the backend here and the Isis template which comes with Joomla. What does that have to do with the frontend template?

Also, like I said, rolling back to 2.6.8 fixed the issue.

The quickstart package contains other extensions as well.
If some of them are outdated, then issues will arise.

This goes for the front end and the backend as well.

I am no longer able to write anything into the title input box. It just shows blank with no cursor and seems uneditable. This happens with Joomla Isis backend template.

Please can you fix this asap?

See attached image for reference. Problem area highlighted in red.