18 days ago - AndrewT - Direct link
This reads the same as this report:
forum.paradoxplaza.com

Surviving Mars - Guaranteed/Repeatable Softlock

Description Guaranteed/Repeatable Softlock Windows Steam What is your game version? 1010784 What DLC do you have installed? Space Race, Green Planet, Below and Beyond, Stellaris Dome Set, Marsvision Song Contest, Colony Design Set, Project... forum.paradoxplaza.com forum.paradoxplaza.com
I'll add your save to the bug report I lodged on that.

Please just put this save aside, and try it as you seen new game patches come out.

Sorry for that problem!  
5 days ago - AndrewT - Direct link
I've still only seen this affected you and that one other case. Why it happens for you so often I have no idea, I am sorry!