Fairly frequently, when I open a saved world I will discover that the game will have reverted to the original creation conditions - I'll be standing at the original spawn point, usually with an empty inventory or just a blank map in hand, and all progress/changes in the game since the world was created will have been erased.
Also, if I made a back-up of the world when I most recently saved and exited, that back-up will also revert to the original world as originally created conditions. Older back-ups usually work correctly.
Comments 5
Okay, on my most recent game I experienced this bug after about 10 days pay, when my save file was approximately 14 MB in size. At that point I'd built a multi-level tower/base near my spawn point, and explored another nearby island and started to build a house there as well.
I found that my main game file, and the copy I'd made of it both were effected identically by the bug.
And today I experienced the bug on a new survival world I'd only played for two days, and where my save file was smaller than 9 MB. It was a vanilla survival game using the ChromaHills texture pack.
The fact that both the main save file and the most recent back-up copy of it were both corrupted suggests that the bug occurs during the exit and save process.
I believe the "reset" to spawn can happen both when a game is "saved and exited" and when a game fails to open properly (though I'm not sure whether that in itself causes MC to "save" the game again).
If I open a saved game and it has reset to the original world spawn, then any copy I made of that particular save will always reset to the spawn conditions too.
If I open a save, and I get the 'There was a problem loading this world' message, then sometimes when I subsequently get the world to re-open successfully the "reset to spawn conditions" will occur, but in that case a copy of that particular saved game is usually fine.
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I think the problem seems to become more frequent the more you've played in a world. Smallish save files don't seem to "reset to spawn conditions", but once you get a file in the 30-40 MB+ range (after a week or two of daily play) this bug seems to crop up more often, but even at 40+ MB most worlds have only barely begun to be explored, so it's a truly annoying flaw.