After installing Windows 8.1 Update 1 (Spring update KB2919355), our enterprise Windows 8.1 image began getting User Profile Service failed the sign-in. Uninstalling the update fixes the issue. The update somehow modifies the default user profile causing write access issues which is evident in the event viewer.
Things I tried:
1) Re-applying parent permissions to Default profile folder
2) Disable CopyProfile before sysprep
3) Creating a new image with Windows 8.1 Update 1 ISO from Microsoft
None of them seem to work. I believe update 2919355 will be needed to continue getting future Windows 8.1 update. I might try looking at the specific files that the User Profile Service is complaining about but it seems to be random.
Anyone else experience this?