Hello,
i have purchased tje K2 Joomsef extension.
But, when i have joomsef enabled, the snippet with vote/stars system of K2 doesn't works.

Browser console give this:
XMLHttpRequest cannot load www.creazionimultimedia.it/media/foundry.../dialog/default.htm. Origin creazionimultimedia.it is not allowed by Access-Control-Allow-Origin.

But, with Joomsef not enabled, javascript snippet of vote/stars of k2 works fine.

Please solve this issue

Hello,
Try setting the "Set page base hrev value" option to "Yes - use only base URL" in JoomSEF's Configuration on the Advanced tab.

Done. Purging suf ulr cached.
But nothing happens, same error and same issue.

I've just noticed that your AJAX call is trying to call www.creazionimultimedia.it/media/foundry...s/dialog/default.htm which uses domain with www from a page that uses domain without www - creazionimultimedia.it. This is considered cross-domain scripting and it shouldn't work anyway. I don't know how this could be affected by JoomSEF. I'd recommend you to use consistent domain name, since your website is automatically redirected to non-www version, you should probably stick to it.
Is this your custom script for K2? Or can I enable it somehow in K2 so I can test it locally?

Thank you very much.
I put in the Joomsef configuration "Always using www-domain" and now it works.