This started as a problem with extra fields, but I think it's broader.
The issue is as follows:

When I open an item (existing or new) and click on a tab for, e.g. attachment, extra fields, video, image or image gallery there's nothing there.

The page remains teh same, but the editor content window disappears and nothing appears to replace it. No extra fields, no attachment fields, nothing.

It happens in both Chrome and firefox.

Someone helpfully suggested a JS error and also suggested debugging to find it, but I have no clue what to look for.

Are there known compatibility issues with this element of K2?

Can anyone help?

Many thanks if you can.

I've attached a screen shot showing how it looks.


Simon