Thanks for the Specs Christian! I have that exact iMac at home, although I have 128 GB of ram. Are you running any other apps while you export or preview Apollo apps? I just used Apollo 8x to slow down 5 1/2 worth of footage and it turned out great with no crashes. All that means is there is a solution out there to your issue we just need to find it. I first would update to 3.1.10. 3.1.10 solved a couple stability issues for me. It just came out today. Let us know what happens once you do.