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Hey again, I've found the problem. Like you warned earlier, I got an infinite loop at my SimpleBreeder. I've checked for fitness, which would (even if the best of population has the worst fitness) never break out of the while(true) loop. It could be that the standardized KozaFitness which I earlier used, could break out of the loop, because it always had a fitness greater than zero. That would explain why the problem occurred after I changed the fitness. Well thanks again for your help Sean. Greetings Bojan ----- Ursprüngliche Mail ----- Von: "Bojan Janisch" <[log in to unmask]> An: "ECJ Evolutionary Computation Toolkit" <[log in to unmask]> Gesendet: Montag, 22. Juli 2013 11:44:56 Betreff: SizeFairCrossover-Breeding infinite Hey Sean, I've analyzed my infinite breeding problem with multiple ECJ runs. Do you know if the SizeFairCrossover-BreedingPipeline does reset the population? Because if the best fitness of the second generation is the worst possible (means 0.0) it runs infinite long and breeds without stop. But the Breeding-Pipeline should reset the entire Population if there are no Individuals with a FScore over zero, because all combinations would also generate a FScore of zero. Do you know where I should modify the Breeding-Pipeline of SizeFairCrossover to reset the population if the FScore is the worst possible? Greetings Bojan