Short story: I died in a biter attack, and had to reload. The last autosave(1) is however crashing my game every time. If I take a previous autosave(2), or a manual save that happened after that autosave(2), the game loads fine. So somewhere in the 4 minutes after my last manual save(autosave frequency is set to 10 minutes), something happened that made the saved game corrupt.
Ah thanks, I didn't see that thread. Kovarex talks about your base getting destroyed with the unloadable savegame, I think I was also being attacked in that save. But I'm not entirely sure.
I tried to load the savegame just to be sure, and I'm glad I did that, because I found out that it is not loadable for completely different reason. (Flame of the flamethrower loading issue).
Anyway, the bug has been fixed, and the save game is now loadable (in version 0.8.1).