I've got the newest C2 beta, r231, and it required me to upgrade nw.js. Even previewing a blank capx, I get this error when it starts up:
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nw.exe - Entry Point Not Found
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The procedure entry point PowerCreateRequest could not be located in the dynamic link library KERNEL32.dll.
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OK
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I wanted to check if anyone else is having the problem before posting a bug report. I'm on 32 bit vista SP2.