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Strange, because it doesn't work for me.
looks like the new build didn't solve this problem.
winxp sp2 works like a charm on my macbook. I have 2 gb ram.
Vista also works, bu vvvveeeeeerrrrryyyyyyyy slooooooow. despite 1024mb allocated...
Try Preferences from the menu. Power off option was for some reason in "suspend". Change it to "power-off". This solved the problem for me.