We just released SmartSearch version 2.4.4. In this release, we fixed two bugs - one regarding wrongly purging the available fields list when editing a prepared search. This has happened if a datagenerator was activated which has no fields.
Another issue regarding the display of synonyms was fixed. In the case of two opposing synonyms they have been merged which apparently removed one of the synonyms. This was a display bug - so no synonym got lost.