Managed metadata keyword auto-completion (when you type the start of a taxonomy keyword, it auto-completes the rest) works on one of my sites but not the other.
On the non-working server, there is a JavaScript error "Server method 'ValidateTerms' failed".
As far as I can see, the set-up (features, rights etc) is identical. What could be the problem?
Only the auto-completion is broken - everything else works. If I type a new keyword, it ends up in "System" like normal.