Currently MC 1.3.1+ have a bug with the snooper thats comes ofthen by Windows Vista.
The bug caused a free cam acting ghost walk but the player can't see its self.Block breaking is hard(They will return)
Walking will cause a pull back or the ghost walk its self
If someone have this too
Try this:
Heres what u do:
1:Go to the bottom left corner of the screen and type %Appdata%
2:Go into .minecraft
3:Delete all the files but dont delete servers
4:Download OptiFine
5:Re-download minecraft by clicking the icon
Your done!(Snooper settings don;t get the change to collect hardware specs)