OK. So I had made it to the third floor of the academy and had made a lot of progress, at different times saving the game under a name, then quick loading to start the next foray into the level, as I want to see what the different consequences were. I thought I had finished saving a quick save, then it glitches.
Now I am trying to get a saved game to load, and when it goes to start the display of the game field it dies. It goes to it config screen and I configure it, and retry, yet it fails again, in Act IV, I haven't tried an earlier one yet.
Well, interestingly, an earlier save works fine. So what is up with the last Act?