Conflict between Taxonomy Manager and Taxonomy Import/Export via XML

It seems there is a problem when activating the module Taxonomy Import/Export via XML (7.x-1.x-dev).

When this module is activated :
* an orphan term can get a parent term (ok !) ;
* a term which has already a parent term cannot get another parent term, despite the message "Updated hierarchy" displayed (no effect in fact).
* a term which has already a parent term cannot remove this parent term, despite the message "Removed parent" displayed.

When Taxonomy Import/Export via XML is desactivated, all work fine.

I hope this will be usefull to improve your module (which is very good ! native one day in drupal ?).

Sincerly
Yann, on drupal 7.12