Ugh. I went out again tonight and did the same session. It's a set of 60 light frames and 9 dark frames. All 60 light frames at 3.2 seconds each @ ISO1600.
I did what Garyh said to do, but didn't work again! Darn!
I used to be able to stack good and then I got the 40D and stacking started sucking. Could it be that there's a big dark lit tree in the images?
When I auto level it, it looks like garbage, but I did get the flame nebula, a lot of nebulosity in M42 and the running man.