Update for Windows 8 for x64-based Systems (KB2751352) may be interfering
Booting to dsektop
This is related to my previous post https://forums.stardock.com/432763. After clean install of Windows 8 RTM; all apps installed with start8 last. PC would boot to desktop; bypassing metro ui. Ran windows update and installed KB 2751352. Rebooted and pc went to metro screen; not desktop as before. This also happened on my pc that was upgraded from windows 7. To test; I uninstalled the update form both pc's, rebooted and right to the desktop. I ran this test 3 times and got the same result. I can't say for sure if this effect of the update is incidental or if it's by design to block start 8. I recall that MS has said they would block attempts to bypass metro ui.
Here's the link for details on Update(KB2751352): http://support.microsoft.com/kb/2751352