After a power failure caused the computer to shutdown, I rebooted the computer and Keepass started automatically
and opened up the password file without me having to type a master password.
Also the same thing happened when I shut the computer down using a forced shutdown from the task manager in windows in which all programs were automatically shutdown and the computer switched off. I have only noticed this behaviour after
upgrading to the latest version a few days ago.
the operating system is windows 7 / 64 bit
This is only possible if you have set a command line switch to supply the password or key file.