Not sure if it is indeed a free energy bug, but population in my sim suddenly jumped up by 1500 bots. I figure someone might want to look at that... As usual, the sim is rar-ed and renamed to txt.
Upd: Hm, I killed some and the rest died on their own. Must be just a bad mutation with uncontrolled division...
Upd: Yeah, false alarm. The cost multiplier was down to 0 as well. That explains it...