On a brand new map (Idyllic Valley), first auto save i get this.
edit: Had to disable auto save, as i just got the message again.
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Same here. I tried to manually save and rather than getting my town name, it automatically named it ‘Autosave 1’
Just bought the game, first time running, never tried to save but I guess the autosave kicked in and I got the same error message. I also can’t seem to manually save: the suggested name is “Autosave 1” but it just gives the same error message.
My game just updated to 0.7.5 and I started a new game in the new biome. Every time now it tries to save it gives the message:
“Game failed to save properly. The failed save file file has been named: FrontierSaveFail.sav”
I just tried saving, got the message, jumped to main menu and loaded the new save.
Everything seems to work.
So at least we’re not losing our saves. 
Though it insists on calling the save file “FrontierSaveFailed.sav”, meaning we can’t have multiple savefiles atm.
yep just got that too
Okey i was too fast earlier.
The saves don’t work.
All stone on my map are now gone.
So the error seems to be related to stone.
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I have been able to save and load without incident. and I still have rocks
私もセーブが出来なくなっています。データは保存されているようではありますが、必ずエラーメッセージが出ます。早急に対応してほしい。
This happened to me too. The autosave failed and the manual save failed. When trying to load the FrontierSaveFailed file now everything is hosed, no resources, map is rendered all black, basically borked. This is concerning as I have 40 hours in my town… 
I have tried various things to reproduce the issue.
I started a new game with the same settings (Idyllic Valley, large map, pacifist, name: Eastmarsh), and it saved fine.
I started a new game with the same settings and a different name, it also worked fine.
I started a new game with the same settings, same name, and same seed. That worked fine too.
File appears to have loaded correctly. Cannot update save name and autosave isn’t functioning as it was (two different files)
Same thing happened to me, but when I reloaded the game all my stone had despawned. It’s happened on two separate maps so far - both large alpine valley. At least one of the two maps had the new gargantuan stone on it.
Noticed when I went to load that it edited the name on an older city which I hadn’t played in two days.
Oh my! Tragic. What has all this been about, if not the stone?
Perhaps try loading a save from the old version that has a bunch of content in it? I suspect it’s something to do with the new version against a complicated save from the old version. Mine for example, was 40 yrs in.
I started a new game immediately after downloading the 0.7.5 patch. The first save on that game failed.
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We have a fix in the works which we will roll out ASAP.
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Sounds good 