Can't add NEW_ITEM on Fields builder page

In Dolphin 6.1, on the Fields Builder page when i try to add a new item (ie drag the NEW_ITEM box over to the Active Items section) i get this error:

    “Sorry couldn’t insert new item. Please check if NEW_ITEM already exists”

I DON'T have another NEW_ITEM box in use. Only the items that in the Active Items area are the ones that were there when i installed Dolphin 6.1. I want to add new fields like ethnicity, for example, and now i can't. Any ideas on how to fix this problem? I have run into other people with this problem but nobody has an answer!

I still get the message if i use firefox

I hope this makes sense...lol