Sorry, I misremembered. Try go left from the floating blocks. In the end there is a stone statue of some sort of beast. Press up and something naughty would happen. Then the blocks should starting to work.
I went to the stone statue and pressed up and the animation happened, and I heard a click. But when I went to the platforms that help go past the forest, they were still grey ;~; The other platforms that help you get to the top still work without pressing up on the statue
