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.
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duplicates 1
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Nothing spectacular in the crash report.
Were the old worlds generated with vanilla minecraft or were there some mods involved ?
Duplicate of MC-2548.
Please force a crash by pressing F3 + C for 10 seconds while ingame and attach the crash report here.