Also them averages have refused to be over 50% despite me doing the game 100% twice. That glitch won't happen in that save file at all if you are able to proceed normally. So the best bet is to record with Fraps and: start the game, save immediately, see if the game glitches, stop recording, maybe restart and load the save.
Now, this happens randomly, but as of typing this text, it didn't want to occur at all when Frapsing DOSBox (at 60 fps, if it makes any difference). Also I encountered a problem with Floor 2, that if you reveal a certain secret (the one on the left side of the wall in the long corridor, where turning in the end of it has locked door leading to the exit), you need cheats to complete the floor as you can't access a certain place at all. The download available is a hacked version 1.0, without the copy protection.