Dungeon Defenders Freezes

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http://ubuntuforums.org – I got Dungeon Defenders through the Humble Indie Bundle 7, but when I start the game (from terminal ./DungeonDefenders), it shows the splash screen, then goes to the splash animation for the production companies/engines (Instinct and Unreal), but during the splash animations it freezes. I've started it several times and the furthest it managed to get is partway through the Unreal animation. I checked their system requirements on their wiki and I should be fine (granted the hardware listed was okay under Windows, they didn't list Linux requirements). Ubuntu 12.04.1 64-bit AMD Athlon II Dual- (Hardware)