The simple hierarchical select widget does not work on a BOA server. The widget displays only an empty field, instead of the option to select or add a term.
I suppose there is some filtering going on somewhere?
Firebug console displays the following:
POST http://example.com/js/shs/json 404 Not Found 16ms
<head><title>404 Not Found</title></head>
<center><h1>404 Not Found</h1></center>
I believe this used to work before. Anyway, filing as feature request.