I just got the new su2 verison. When i press the L Nav button during flight so the fmc can fly the path. My fmc auto disconnects it. Saying something like not on heading intercept. It doce that with the heading button on or off. This didnt happen with the other version.

John You must select a heading to intercept the the LNAV flight path in the nav display.Simply fly a heading to intercept the flight plan path magenta line,do not fly direct to a waypoint in the flight plan you must fly towards the magenta line and then select the LNAV button. Regards Paul