I solved the puzzle in Dorn's Deep with the giant circular room - the floor no longer shoots lightning bolts at me - but the stairs which were supposed to appear in the center of the room never did. Any way to correct this?

<font color=silver>SPOILER
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After solving the floor puzzle you need to return to the room with the circular table. One of the statues has a hammer that needs to be pressed to open the staircase.</font>