>I think I can repro this. (Always using my ID and Firefox 3.0.5, I noticed it is downloading a new version in the background)
>
>If I enter my id manually, typing it entirely, it works fine.
>
>If I start typing it, but then I select with the mouse the number from the dropdown list created by firefox's autocomplete by clicking it, it goes blank when I press enter (eventhough the displayed number matches mine)
>
>If instead of selecting the number from the autocomplete with the mouse like in the previous example I use the tab key, then I get a search result in a new window with no matches found

All this seems to be related to a behavior of the browser. I do not know what it acts like that. But, for sure, if you use the keyboard to type it entirely, it should work.