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I tried with 2GB allocated and nothing else than the modpack and I have the same issue, but now the launcher crashe when I try... but it work with some pack I've tried in 1.6.
I've the same issue with all the modpack in 1.7, third party and FTB modpack, but the launcher don't crash after I try to launch the modpack, it just reopen like nothing happen...
the pastebin of the console: http://pastebin.com/NLNLYnrN