The save format in 1.1 has changed and 1.0 wouldn't be able to load it even if it didn't (since old game versions can't load new game version saves). If you opt into the 1.1.x steam beta you can continue the save. Or load an older save.


Well you where right even though i don't remember using ...

I play Factorio on steam and when i went to play i saw their was a update and steam as per usual has auto-updated the game. I loaded up my save and played for a while with no issues. Then i had a online class to attend, so i save and quit the game, while i was on that online class steam auto-updated ...