Cannot get a returned value for dialog list selection on web

Using the rather splendid Table Walker from the sandbox to construct my dynamic table, I have run into a problem when accessing my form through a browser (IE), which my lack of understanding of web dev is letting me down.

On the table walker pop-up input window I have some text fields and a couple of dialog list fields. The latter get their values from a profile doc using @GetProfileField, and display the available values to the user on the web.

The problem is when all fields have been set, when you ok the input box to return to your form, the text fields in the table are updated ok, however, any selections on the dialog list boxes are not shown and I am really struggling to get anything returned from these selection fields.

I would really appreciate any help on this - thanks for reading.