I'm towards the end of Hive of the Mantids, in the lava room where there's a switch with two mantid soldiers near it. If I flip it, a lift triggers to my left that I can take up to the last queen embryo. The switch will not flip. I thought it might have been because I destroyed the master computer already, but I reloaded a previous save and went back through the level without destroying it and it still won't flip. I can't progress without this switch doing its thing.