I'm trying to collect my 8th fragment, and have seen in walkthroughs that hitting the interactive switch inside the Gate puzzle (view more gates/bridges THROUGH wood gates) on one of the stone wall fragments causes the wall configuration to change to an acute-angled section that has a fragment (which would be my 8th) in it. I hit that wall button, it makes a noise, and...nothing happens at all. The one that makes the bench appear and disappear works; out in the main area, the one that changes the color/texture of its wall works, as does the one that makes daisies appear/disappear, but not the one by the three pine trees - similarly unresponsive. Am I missing something about a sequence to all these switches before they'll work, or is this a bug? I'm finished with the game, other than getting that last fragment...so this is frustrating!