Ever since snapshot 13w41a came out minecraft has just stopped loading when I've tried to run it. It always goes to the Mojang screen this it stops and says (Not Responding) in the top left of the page. When the snapshots did come out I was able to run them once then they just stopped working so I'm pretty much stuck in 13w39b. Help would be greatly appreciated.
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IMPORTANT ADDENDUM:
This appears likely to be an issue with certain graphics cards. I have an Optimus setup (an Intel card that is used most of the time, alongside an NVidia card that can be activated for graphically-intensive things), and forcing the game to run with the dedicated graphics card resolved the issue.
I have this too, in Ubuntu 12.10 with the Cinnamon desktop environment, 64-bit, Java version 1.7.0_25. You can see the output to the terminal at: http://pastebin.com/agwEvZn9