What is your default flight - the flight that starts in P3Dv5, whether that be after you select OK once the scenario screen shows up at the beginning (provided you have selected "Show on Startup" on the scenario screen)?

It's possible that it could be in a ready to fly mode if the default flight is used, but seeing as that was the first thing I changed after starting P3Dv5 the first time after installing it, I've never tried it. I've also cheated, because my startup flight is the C172 in a cold and dark setting (with avionics switch turned on). The C172 was copied from FSX to P3Dv5, and other than the problems I've previously mentioned, the L-1011 works fine for me.

I just started the L-1011 in P3Dv5, and after selecting "Ready for Takeoff" (twice), it is then in a "ready to fly mode".