OK! Where's the support on this issue. I just took the time to load 60 subs, the associated darks, flats and bias frames. Executed stack and at 34% (it's always at the 34% mark) into processing the darks, the program crashed. It's very aggravating at first, but after posting to the forum and receiving no reply, then it happens again... it's extremely aggravating. So first we have very aggravating, then extremely aggravating. Let's not go to the next level. What is going on with the software?