[Blind-sysadmins] Cross domain trusts.

Hello, I've been tairing my hair out over this one for about five hours now. It's about the third time I've done this and I've never had a problem before. Basically I have two domains. Lets called them hosed and cloud. Hosted is 2008R2 functional level for the forest and domain. Cloud is 2012R2 functional level for the domain and forest. I can get the trust working. However, I never see the trust when I click the "look in" button when trying to add groups from hosted to cloud. When I validate the trust it reports that it's all working properly. Do you have any ideas? I must be missing something stupid. Thanks Darragh