Version 1.4 is the latest SP for the 767. I think it came out in December 2009 although I can't remember if that is exactly when.

Start FSX, go to Free Flight and then to Change aircraft, highlight the CS767 and then click on Details. This will tell you what version of the 767 you have. If it isn't 1.4, then go and get a new link and download the latest version.

Hope this helps.

Mark