Thanks for the suggestions, ladies! Cyndi, I hadn't heard about holding onto the threads as you start to sew...I'm gonna try that.
I don't think it's a tension issue, I just had my machine tuned up and adjusted and it seems fine w/ other fabrics. The thing that gets me about that satin, is when I sewed another piece of it using the same thread, needle, tension, everything, it didn't "run". But on the purse it did. I just don't get it!
Makes me want to give up. Seems like every one of my purses has an "issue".