I started playing the 1.6.2 version, single player, and it keeps crashing. I was able to get into the world at first, but now it keeps crashing before I can even do that.
I also tried installing the 1.5 version and that wouldnt even load. It would just freeze up.
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Duplicate of MC-10167. See the solution there or here: http://hopper.minecraft.net/help/failed-check-session-lock/
Based on a crash report provided in this issue, I believe with high certainty that this report may be a duplicate of MC-10167. You can view all information known about this specific crash at MCX-886.