@Dragyn you are correct I use it for the default name until it is change for the high scores. I was thinking same thing might be apostrophe but I changed the name on my device at Game Over scene to include apostrophe in it and it worked fine. I think it had to do with the way I was setting the label string but don't know for sure since it never occurred on any of my devices.
Update 1.1 will release as soon as iOS 4.1 becomes public. It uses Game Center that is why it hasn't released yet. Please update and let me know if that fixes this problem if not I will not use the device name and just use the string "Me" as default.