Here's the scenario:
Brand new Windows Server 2008 R2 Enterprise server. Set up with local Administrator account, all working fine. A Domain Administrator (not me) joined the server to our domain and rebooted. I logged in with my (non-Domain Admin) domain account, which is a member of the local Administrators group. I have access to the C: drive, but whenever I try to access any of the other local drives I get 'Access Denied'.
I logged back in with local Administrator account to check NTFS permissions, and even that account had to take ownership of the folders before I could amend the security, which I didn't understand. Anyway, I did that and then found that all of the security for drives other than C: had been wiped out - nobody had access. So, I recreated the security, making sure the Administrators group had Full Control. Logged back in with my domain account (DEFINITELY in the Administrators group) and still can't access those drives.
What gives?