Hi
i am italian user and sorry for my bad english.
When loading ksp the program crashing with mechjeb2 installed.
Removed mechejeb2 ksp loading and run corretly.
I have win 7 pro 64 bit and ksp 0.24.2.559 (x64)
Thanks

this likely isn't a code issue, but a compatibility issues, please ask for assistance on the forum while posting your outputlog.txt

How?
the file is too long for the number of characters allowed ...

post your issue on the forum for mechjeb2 here: http://forum.kerbalspaceprogram.com/threads/12384-PART-0-24-2-Anatid-Robotics-MuMech-MechJeb-Autopilot-v2-3-1

tell what vesion of mechjeb you are using, post your logs, and list your installed mods