I saw them there, then clicked the button. They vanished and the site said I did not add tags. I tried this in multiple browsers, all of which gave the same result.
On Mac OS X, I used Firefox 3.6.20, Safari and Chrome; on Linux, I used Chrome and Firefox; and on Windows I used IE8.
The interface I see here on Meta — the window with potential tags appearing as I type — does not show up on the primary site at the moment, so I can ask questions here but not there.