I was going to suggest something but I see by all the diamond tools you have that you cheat so I won't bother.
also, colour has a 'u' in it.. :tongue.gif:
Well that was one totally very useless post. Consider not posting at all, next time.
To your question op, do you have any mods installed?
if yes, it might be one of them.
if no, delete your binfolder in appdata/roaming/.minecraft, it should solve the problem, unless its hardwareproblem.