On a sidenote, game eats some savegames after saving them and when restarting. Happend on 2 machines now. First though I had missed the save button before quitting, but now a second one is gone with 40+ years. Older one (24 years) still there.
Same seems to have happened to me. I manually saved my game twice during a 5-hour session (with different filenames), but when I came back and wanted to load my game, the Load list was empty.
EDIT: It seems the files themselves are still in the Per Aspera\SaveGames folder, but the game doesn't present them when I try to load them from the main menu.