Not sure if its the same problem or a slightly different one, but we've got similar problems with permissions on several machines running Windows 7 Ultimate 64bit.
We have a domain server (2003 SBS) which requires us to log on as domain\user. All users are administrators and UAC is turned off. These are all legit OS's, and were clean installs (not upgrades).
Most files work fine, but on some when trying to copy files or delete files from a data drive on a system with Win 7, get "must have permission from domain\user", which we are logged in as. We've tried taking ownership (which is silly because the owner is logged on anyway) and of course that doesn't work. We've tried the registry hack listed above, that doesn't work either. All of our systems are dual boot (with XP Pro), and logging onto XP with the same user/owner doesn't work either.
Since we've got this random problem on more than 1 system, and never had it before installing Win 7, it appears to be a Win 7 bug with profiles (the files in question are not inherited and won't allow us to inherit even though our users are administrators with full permissions). I have no idea why it happens on some files and not others. I have no idea what causes it or how to get around it.
Any help would be greatly appreciated as we're now virtually locked out of editing our own files. Thanx in advance.