There is a bug with 4.1 host profiles, profiles built from a reference host that were joined to a Windows Domain using Authentication Services cannot be successfully applied. The Host Profile prompts you for credentials to authenticate and gets stuck, next in the host profile wizard no longer works. I also notice if you select options in the host profile settings displayed you may receive an errror “an internal error occurred in the vSphere Client. Details: The given key was not present in the dictionary.”
According to this Communities thread it is indeed a bug and will be fixed in future releases.
In the meantime you can disable the Domain join setting in the host profile by editing the host profile “Configure a fixed domain name” in “Authentication Services/Active Directory Configuration/Domain Name” and set it to “Host not joined to any domain” or remove the reference host from the domain and updating the profile using that reference host.