I just want to add that the same thing happened to me yesterday. I was Ironman and cloud saving to steam.
My game that I spent three days on (played as soon as I would get off work until like 2 in morning) froze for like ten minutes. So i Ctrl Alt Del and closed it, and next time I loaded it up I could not even open the save. It said something like "broke save" under the save.
Really really sucks, it made me just turn the computer off and not play anymore. LOL
If you could add this information to the bug request that I made, that would be great. This way we have a "collection" of Ironman save file problems in one location
http://forum.paradoxplaza.com/forum...appearing-Destoryed-cloud-save-game-(Ironman)