That was it you are a god thanks. You have to the users in the OMgroups individually not as a group.
I have installed OpenManager on windows 2008. My local administrator is able to login to the web interface and have full rights. After puting the server on the active directory the domain admin accounts can login to the web interface but it doesn't have admin rights. I have tryed adding the domain admin account to the OmeAdministrators group but I cannot get admin rights. 
OpenManage user access