[MC-59220] Major 14w26c Bug!!!!

I had a map on 14w26b and I open map with 14w26c, all blocks placed by me dissapear.ALL!!!!
Disperated by this, i opened the map with 14w26b and all is fine.All blocks are fine.
Please "debug" this snapshot (14w26c)
P.S Sorry for bad English.

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Comments 3

Itouch2 2014-06-26T16:11:17Z

Are you serious ?

You have to use a backup of your world that was never opened with 14w26a or 14w26b, otherwise opening the world save in 14w26c will destroy most of the chunks in your saved world.
Never use snapshots without making a backup of your saved worlds first.

From the snapshot post.

John 2014-06-27T21:08:15Z

If you are updating from 14w26a or 14w26b, your saved world has corrupted blocks and it will be heavily damaged once you open it in 14w26c. Please use a world backup that was saved with a pre-14w26 version.
Never use snapshots without first making backups of your saved worlds.

Some people..

Mikeey 2014-07-08T13:14:43Z

All that happened is the block ID's have changed, to fix just go into mcedit and change the the blocks labelled as "Future Block!" to their usual ID and it'll be fine.