This is my first time using a Mac since OS 6 days. So far, not so good. I just received a MacBook Pro, straight from Shanghai. I'm at the "Create Your Account" screen and it had my name ("David Kirchner", without quotes) and a short name ("davidkirchner", which incidentally is only one character shorter) in the fields. I changed the short name to "dpk". I clicked "Continue" and I get a dialog box stating: "The name you entered cannot be used. This name is not available. Please enter a different name." Red arrows appear next to both the name and the short name, suggesting both are invalid. As far as I know, there's nothing invalid about my name. It's served me well for decades. According to Google, I am the first person to ever see this error message. I'm both honored and humbled. Any ideas?