I think the ComboBox autocomplete doesn't like New Jersey. =)
Dojo version: dojo-release-1.1.1-src
Client: IE 6 win XP (SP2)

I am using code copied from the Dojo book example for the dijit.form.ComboBox (the one with ItemFileReadDataStore):
http://dojotoolkit.org/book/dojo-book-0-9/part-2-dijit/form-validation-s...
...with a few minute changes (see below).
I click inside the text input box, and delete the default value with backspace.