Introversion

By mistake, I demoted an officer. I then re-promoted the Darwinian. There was no crash, and the game proceeded on. After clicking to move the Darwinians with the officer, however, the game froze. I couldn't exit it, and I couldn't get back to Windows in any way. Since it was a freeze, no blackbox.txt was produced. In the end I had to restart my computer, so there's no screenshot either.

Did you click on a radar for your darwinians to be transported? If so, that bug is covered here

Nope, random point on the ground.