I just got a new mid 2015 MBP for Christmas. I was setting it up and getting everything installed on it. I have it set up to use my App Store password for the computer. I was just in standby and was trying to log in. It took ten tries with the correct password before it would unlock. I thought that maybe I was entering the wrong password, so as a test, I entered the correct password and kept clicking the arrow. This time it took eight tries before I got in to the computer. I can disable the password from standby, but I am curious why it is taking so many tries to log in with the correct password. Anyone have any ideas? It's brand new, and has only been out of the box for about an hour.