Unused Tags Not Loading in Interface

-- HikaShop version -- : 2.6.0

I have a strange problem which suddenly started today and no idea why. It's with the tagging system on products in the admin.

When I click within the tags box, it only shows the greyed out ones that have already been selected. The unused ones are not shown in the list.

It was working fine, and then stopped working. The only thing I did was change a couple of tag names which shouldn't cause a problem. And changing them back hasn't helped.

Attached screen shot.

Some testing:
- I tried adding a new product and all the tags are available. The interface works as usual. Selecting a tag, clicking away, and then going back to the tag box works as normal with the used ones greyed out (second attached screen shot).
- Adding a new product with some tags and then editing it yields the same result.
- When editing a product, typing the start of the name of one of the missing tags doesn't cause it to appear.

EDIT: Some further testing:
- If I remove one of the used tags, it is then available for adding back in. The code only contains the used tags when the page is loaded, with the unused ones missing, so it appears to be a server-side problem

Hi Jerome,

I see, thanks. But surely it's still possible there's a problem with the way it's being called? This could perhaps be a problem with the data not being passed to the control. Any pointers for where I should look for that call?

Is any paid support available for HikaShop? I've tried posting in commercial with no response.

Nigel