Simple, from what it sounds, its the issues with the new features in SE-B, are you sure you have an ISO folder on your root, if you dont it will freeze. Also the GAME and GAME150 folders act different, but more than likely its because you dont have the ISO folder, if im wrong just use recovery mode to downgrade to 1.50 then reinstall 2.71 SE-B, also read the readme, it goes over these issues.

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