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Both for manual and automatic saving. There are different creatures with different settings saved before. If I let the different creatures simulate at the same time they are all saved under the name of the last started simulation.

A bug I found in the Windows version:

If you want to run several instances of the simulation at the same time and then save them, all instances  save under the name of the last instance called. Unfortunately, because of this bug you cannot run and save multiple instances at the same time.