I see that not many people are visiting these boards anymore, but here goes...
I was running my first attempt at an evosim last night, and when I got up it said "overflow. saving sim in saves directory as error.sim", if I load error.sim, or any of the autosaves (I only set it to keep the last 10), I instantly get the same message. even if I click the ignore errors button.
oh and I was using version 2.43.1L, and here's a zipped copy of the error.sim file.