Which Content Type Field?

Thanks for taking the time to build this module. I've run into an issue and hoping you can point me in the right direction. Not sure if I'm attempting to use the module in an incorrect manner.

Running 5.2, taxonomy, content_taxonomy, cck_taxonomy_ssu and a number of other CCK field modules such as address, email, etc. Also have jQuery Interface running.

I created a new vocabulary (activity), added a 2-level hierarchy of terms (for example, Sports-->Skiing), and then created a new content type. When setting up the content type, I chose to add a new field. My expectation is I'd like to use the hierarchical select to have users choose an activity.

I tried several variations and wasn't able to get it to work. I selected "Taxonomy Vocabulary (super select ultra)-->Activity", and I also tried "Taxonomy Field-->Select List" and "Text-->Select List". In each case when I tried to create content, the Hierarchical Select did not work.

The README file says it works with "any module that uses a select form element, of which the options are ordered hierarchically ...". I would have thought the Taxonomy Vocabulary option should have worked. Maybe it has something to do with the Super Select Ultra version? Did I miss something?