Fsx do not accept plan-g flight plans

[lpcdc3]

hi. I' m italian, I'm sorry for my bad english.I've this problem: when I save the flight plan, I go to fsx and  I upload it. When I do this, I start the flight, but it does not load. in a few moments fsx goes off. When I upload a flight plan not made using plan-g, it works. Any suggestion?
Thanks
Lpcdc3

[tim arnot]

Did you update Plan-G to build 50?