Bug report, hope this one wasn't reported before (looked at the last few pages, didn't see one identical at least)
In 2.10 at some point an alien colony appeared, and it seems each time my vessel gets in radar range, it crashes the game. Happened with 2.11 after copying and loading the save as well (2.11 extracted into a clean directory, only savegames copied over)
In this case my vessel was flying towards another mission, but in 2.10 it was, if I remember correctly, just chasing a UFO, neither case directly started a mission yet.