For me, the following works every time: - Switch the game to fullscreen mode in the graphic options (NOT windowed fullscreen mode, or windowed mode). - After making your selection at the nav terminal, ALT-Tab out of the game. - Wait at least 30, better 40 seconds. - You should be able to switch back now without crash.

This post would fit in here much better if it was posted by either of the tanks you mentioned. For the powertech tank, because apparently no one except him (including you) knew the encounter mechanics - and for the juggernaut, because someone else (you) rolled on his armor just because you "can rip the mods out".