Is Autocomplete Completely Broken?

Is Autocomplete Completely Broken?

Using browsers: Chrome, Firefox, Opera, MSIE, Konqueror, Seamonkey

Running on: Windows 7 Pro, Windows 8.1, Ubuntu 12.04, Ubuntu 13.1, CentOS 6

Testing jQuery's own API URL:  http://jqueryui.com/autocomplete/ fails.

I don't get any autocomplete activity, including:

1) No "class" modification of the sample text field (should append 'lookup ui-autocomplete-input', but doesn't)

2) No dropdown to select from

3) No javascript errors of any kind

It's like it's not firing, at all ... or not getting any response from the hosted scripts.

And that's jQuery's own example!

My code, which was working previously (don't know how long this has been going on), is no longer functioning, either.

Tried using jQuery's libraries (1.9, 1.10) and Google's libraries (1.11) with the same result ... no autocomplete.

Also tried simply adding the class modifications manually to the field, but no errors, and no autocomplete.

Anyone else seeing this?