I noticed this after upgrading from build 23 to 27 and see it also in 29. When I begin to type the COPY command at the prompt, the space after the command is ignored and I have to enter a second space before I can type the arguments. This only happens when I first type this particular command from the beginning of the prompt. If I edit another command, like CLS, to be COPY, that doesn't happen.
D:\>which copy copy is an internal command D:\>ver /r TCC 15.00.29 Windows 7 [Version 6.1.7601] TCC Build 29 Windows 7 Build 7601 Service Pack 1