i noticed different bug with gravity forms 1.8.5 and your plugin.
- create a dropdown field, and select "Populate with a taxonomy", and choice the taxonomy type (populate_with_taxonomy_field_setting ).
- Save your form and choose a selected value in the choice (choices_setting field_setting).
- Save and back in your form
- The Populate with a taxonomy function doesn't keep in dropdown the taxonomy type selected
- The selected value in the choice (choices_setting field_setting) is unchecked