[MC-7510] Minecraft creates a new world on top of my saves

I haven't played minecraft for a couple months (I think 1.4.3ish) and recently upgraded to 1.4.7. When I opened my old saves, minecraft regenerated completely new terrain destroying my worlds.

Related issues

duplicates

MC-2548 A chunk with previously generated data was cleared, all the blocks and data within vanish

Attachments

crash-2013-01-15_14.56.44-client.txt

Comments

migrated 2013-01-15T04:43:41Z

[media]

kumasasa 2013-01-15T07:32:49Z

Please force a crash by pressing F3 + C for 10 seconds while ingame and attach the crash report here.

kumasasa 2013-01-15T21:57:35Z

Nothing spectacular in the crash report.

Were the old worlds generated with vanilla minecraft or were there some mods involved ?

migrated 2013-01-15T23:47:51Z

I used McPatcher for high-res texpacks, but it was otherwise vanilla.

migrated 2013-01-15T23:49:54Z

Then it's modded!

kumasasa 2013-01-16T06:56:37Z

I used MCPatcher all the time and never run in such a problem.

migrated 2013-01-27T17:48:53Z

Duplicate of MC-2548.