Domain Trusts unable to add users to groups.

Hi i have the following domains:

domain1.root.com (i am Domain Admin and also an Enterprise Admin for root.com)

domain2.root.com(no Domain Admin rights)

I have created a 2 way trust between them (trust external, transitive NO)

I need to add users from Domain1 into a Domain2 group.

When i go to Members and click Add in the Locations menu i can not see Domain2

If i go to "Member Of", click Ad, in the locations i can see Domain2, but it can't find any of the ADgroups or users.

How can i resolve this?

Thanks