I have a site set up with K2. When I try to tag items in the backend, I just get a moving circle, but it does not show a list of matching tags. Also, when I try to enter ratings in the frontend, I get a moving circle but no rating is assigned.

I noticed that this works properly on the 2 new K2 websites I set up. However, for my old site, this does not work.

I think this may have something to do with Javascript. But I am not sure. Is there a way to shut off the javascript?

Any suggestions?

This is caused from a JS issue. Open your browser's developer tools and check under your console for that error.

Actually, it was caused by a buggy extension. I quote the developer:

Go to "Extensions=>Plugins=>System" and disable the "System - MijoSearch Redirect" plugin then that error message will be gone.

When I did this, the ratings and the tag lookups worked as well as another issue.

Thank you for reporting this Dietrich.
It will help users having the same issue.