If you are talkiing about the morphs that give them a very large sized bust.  I just tried them out and they work fine. Are you sure you're using the right ones on the right model version (Something I tend to do alot).
Moilly
  I think they are talking about these
http://www.renderosity.com/mod/freestuff/search.php?section_id=-1&query=Ultimate+breasts&sort=relevancy&use_age=no&older_age=&older_units=day&newer_age=&newer_units=day&username=&section_selector%5B0%5D=-1