I just saved a numbers doc and the program crashed. Now when I try to open the document I get "Can't be Opened". I've checked permissions and I'm listed read/write, and restarted the mac but it still won't open.
I don't think it's common. "I just got this Mac" isn't very informative. Is it used? What year was it made? What version of the OS is installed? What version of Numbers do you have. Brevity is your enemy when posting on a forum. But being too verbose can be bad as well. You need to at least give some basic information, not just ask a question.