BOXI 3.1 import wizard creating duplicate user account names

Hi,

Recently upgrade to 3.1 SP.

I'm importing a list of users with group membership.  This is something we've done in the past successfully.

I've got rows like this...

"Group Name","User ID","Full Name","email@address.com"

My last import of users created duplicate accounts.  I can create a test import file and repeatedly create duplicate accounts with the exact same account name but different ids.

This is causing me a big problem

Can anyone give advice?

Thanks,

Sam