I just watched twenty minute of videos, hoping I'd find a clue...
My 360° revolved cut is entirely inside of the previous boss. It appears to me that SW assumes I'm trying to make a sort of shell, so it does not give me the option to remove the material outside of my sketch. So I extended part of my cut outside the boss. The cut still wants only to remove the inside.
The only way it cuts away the correct side of the sketch is when I construct the sketch so there are no other options.
Is this for real? Am I missing something?