Per my previous post, I am no longer playing that campaign series. I am playing the Contact missions and have not had any crashes.

Yes, I was hosting multiplayer games with my friends. Using only the Editor/mission settings that I know of. There are no parameters options in the Lobby and the description.ext has only about 5 lines in it (see below).

This ticket can be closed. I am done with the SP campaign and am not interested in perusing the issue.