Probably something went wrong with your installation. Please try installing K2 again.

Nope - still same problem. Have tried installing directly over (as per site instructions) and also via the extension manage update facility.

If it helps, I'm also running sh404sef - but can't see anything there that's causing it.

Is there a private message facility so I can send you a link?

Essentially the '&' in the Tag title is being replaced with '?' in the Tag listing URL - it gets as far as where the '&' is in the URL, then breaks e.g what should be:

site/en/tag/word1-word2-word-3-june-2013

becomes....

site/en/tag/word1-word2-word3?Word4_Word5_June_2013=

To the URL it's impossible to keep the & character. So it will be replaced through the SEO handling characters.
Now I want you to tell me your Joomla! version to check about the error you are getting upon installation of K2.

Hi Yiota,

I'm on Joomla 2.5.

So as I understand it, there is simply no way to have an ampersand in a Tag as it's listing URL will break?

If so, I guess we will have to bite the bullet and replace with 'and' after all.

Thanks for your help with this. Best, Tom.

Yes, that is correct. Maybe you can replace the _ you get through the tag's URL to the word in the SEO replacement characters.