Because of multiple reports on this issue, I've tested the demon butler method for a solid 45 minutes. It has worked fine for me, the whole 40 min.
I'm guessing you are either not starting it up correctly (Please look at the first page of this thread, there's a detailed how-to-start there. Please be 100% sure you are doing as it tells you to) or you have a special client setting enabled.
Did you use mirror mode?
Did you use low-cpu mode?
Did you use low-resource mode?
My proggie as proof that the demon-butler is stable (Picture taken today):