While editing a mission, after anywhere from 5-15 minutes the game will freeze and crash. I believe this is because of my computer's Nvidia Optimus software. The crash will also happen if I idle for too long in the menus. I'm not entirely sure how this issue could be solved, but I do know that I did not have this issue until version 0.72. I will try the Dev Branch and update the tracker with any data or a solution.

Specs:
Intel M370 2.4GHz
Nvidia GT520M 1GB DDR5
4.00 GB RAM
5400 RPM 320GB HDD

UPDATE: Dev Branch did not solve the problem :( {F21059}