So I'm in the Hall of Epochs. I have pushed the stone block on the balkony and the one far away in the end of a long run. The walls are now gone but the gates haven't opened. I checked the walktrough and I did all the things needed. I have tryed to run back and push the the stone blocks again and then again, but the same result. This is irritating. Do I have to start over with the quest, or is there a fix for it?

Thanks for your help