On preinstalled OS X (we’re not imaging), when we add a new Active Directory user account to Active Directory bound Macs that are already Casper members we see an issue nearly identical to the one posted here: https://jamfnation.jamfsoftware.com/discussion.html?id=15425.
“I’m seeing a few specific folders being created as files as I log into my AD accounts on my new MBAir Image. So far its affecting Calendars, ColorSync, Components, Dictionaries, KeyBindings, Keychains, Mail and QuickLook.”
The chief difference between that post and our issue is that the files are created alongside the user folders, but with similar names to the user folders, and this interferes with keychain access, etc. Once the duplicate named files are manually deleted, the issue is resolved.